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1. lt sq LO dx 6 915 2 2 40135 cg d U S Patent FIG USER BUT TONS PRESSED ACTIVATE AUTOMATIC ROUTE INSTRUCTIONS UPDATE SPEED AND DISTANCE TONEXT TURN TIME TO BEEP AND DISPLAY NEXT INSTRUCTION Sep 12 1995 Sheet 8 of 8 DISPLAY CURRENT SPEED DISTANCE TONEXT TURN AND STARTING INSTRUCTION WHEEL SWITCH OPEN OR CLOSED BEEP AND DISPLAY NEXT INSTRUCTION 5 450 325 5 450 325 1 ROUTE DIRECTIONS DISPLAY SYSTEM BACKGROUND OF THE INVENTION This invention relates to an improvement for low power electronic microcomputer odometer speedome ters for bicycles which allows the devices to display route directions State of the art odometer speedometer devices for bicycles are wrist watch size devices with wire connec tions to small sending units which sense revolutions of a wheel The device includes an electronic clock for cal culating speed The history of development of these odometer speedometer devices for bicycles is de scribed in U S Pat No 4 156 190 U S Pat No 4 638 448 describes some of the more recently invented features of such devices According to contemporary bicycle industry maga zines these devices are now referred to as cyclocom puters Data that can be displayed on various cy clocomputers includes current speed maximum speed average speed total distance t2. 5 ONY LYYLS 9340934 5 88 g 1 bs SNOLLONYLSNI 3 LNOY SNOLLONYLSNI SLNOY ILYNWOLNY lt a SNOLLONYSNI 4 4 9 d 28 Sheet 6 of 8 5 450 325 Sep 12 1995 U S Patent 28 38015 4 al 8 NOLLVNOISSC 3015 9 1937135 NOLLWNOISAG 34015 a SNOLLYNOISZO 770805 al SNOLLYNO S30 S30 D 710005 8 123735 T1IOHDS 8 3231510 38015 eg FONWLSIG 34015 al ld NOLLONYLSNI TIONIS NOLLONYLSNI_LXZN DCN al SNOLLONYLSNI 04510415 8 5 0 8 NOILYNOISSG OISSO YSLN3 93 1 8 SONVLSIG Y3LN3 8 SONWLSIO 9309533 5 9309533 8 93 JONVLSIQ 34015 e 5 4 NOOR 030934 93053 sa SNOILONYLSNI Sheet 7 of 8 5 450 325 Sep 12 1995 U S Patent 28 30 55384 3713 30 TLLNA ANAS 29 JO 55354 S LINN Ag S LINN Ag 28 3713 30 35734038 ON3 ULNA LYOdx3 GN3S 30 8 28 55384 YO 373 30 5 0 5 SLNOY LHYOJXI 4 1
3. and air temperature as a func tion of one of 1 time elapsed and 2 distance travelled by the bicycle on the face of the cy clocomputer and b means for displaying on the graphs a plurality of point locations each associated with a route in struction 23 The device of claim 22 further comprising a means for storing a sequence of predetermined route instructions b means for displaying a predetermined route in struction on the face of the cyclocomputer and c means for advancing the displayed predetermined instruction to the next predetermined instruction 24 A device comprising the combination of a cy clocomputer with a a communication link to import information from a computer to be stored in the cyclocomputer the information comprising information for calibrating an odometer function to the wheel size the com munication link including al a plurality of electrical wires a2 transmitting means coupled to the computer for transmitting electromagnetic radiation through free space the transmitting means fur ther including means for transmitting to a plural ity of receivers all at one time and a3 means coupled to the cyclocomputer for receiving the transmitted electromagnetic radia tion 25 A device for storing a sequence of predetermined route instructions and communicating them to a bicycle rider comprising 5 450 325 9 a housing for mounting a bicycle b means with
4. a button 2 thereby advancing to the next instruction See FIG 7 At any time the rider can scroll forward or backwards through the instructions by pressing buttons Using an LCD display the screen of the cyclocom puter is addressable with x and y coordinates Alterna tive embodiments can be built with a gas plasma display or any other small flat panel display technology Dur ing a ride the cyclocomputer records time and distance as well as information about the ride such as speed 5 450 325 5 cadence and with appropriate sensors heart rate alti tude or temperature Using the x y addressable display any of these items can be displayed over time or over distance Each of the instruction points 5 shows on the graph The data from any number of rides remains stored in the cyclocomputer for later display or export ing limited only by memory When the graph is dis played the programmed logic chooses an appropriate scale with appropriate starting points and ending points for each axis The selected scales are then displayed 8 In an alternative embodiment the cyclocomputer might be designed so that trip data can only be accumu lated in the cyclocomputer from an actual ride and not by pressing of buttons or importing from a computer Then each cyclocomputer could be used to record in formation from competitions and officials who are not riding in the race would not be required At the end of a ride whether a pleasure tou
5. instruction point at the current speed 7 The device of claim 5 wherein the housing has a display and the means for communicating the remaining time to the next instruction point comprises a means for displaying on the display one or more visual symbols at one or more predetermined times prior to expected arrival at the next instruction point at the current speed 8 The device of claim 2 further comprising a means for calculating and communicating the remaining distance to the next instruction point 9 The device of claim 8 wherein the housing has a display and the means for communicating the remaining distance to the next instruction point comprises a means for displaying on the display the remaining distance to the next instruction point 10 The device of claim 2 further comprising a means for obtaining from the odometer a mea sured distance value and storing it as the stored distance value 11 The device of claim 10 further comprising a means for entering route instructions and storing them as the stored route instructions 12 The device of claim 11 further comprising a means for exporting the stored route instructions to a computer 13 The device of claim 10 further comprising a means for exporting the stored distance values to a computer 14 The device of claim 2 further comprising a importing means for importing route instructions from a computer to be stored in the route instru
6. process SUMMARY OF THE INVENTION The present invention displays biking route instruc tions on the screen of the cyclocomputer The displayed instruction is advanced to the next instruction by auto matic means such as when an odometer measures a certain distance from the last instruction point or from the start of the route or by user activated control such as a command button The distance number for trigger ing the automatic display of the next route instruction can be entered by pressing buttons on the cyclocom puter by recording a number measured by the odome ter when the route is ridden by the route designer and a button is pressed at the instruction point or by import ing the distance numbers for a predesigned route from another computer The route instructions may be en tered at the cyclocomputer with button presses or com 45 55 60 65 2 municated from another computer either a general purpose computer or another cyclocomputer Because each instruction point is associated with a distance number and the odometer is measuring dis tance the cyclocomputer is preferably programmed to display the remaining distance to the next instruction point In addition the preferred cyclocomputer pro gram generates a prompt at a certain predetermined time from the next instruction point using the bicycle speed and the distance remaining to calculate the time In alternative embodiments the prompt may be in the form of a
7. 21 12 1992 Ghaem et al 364 444 5 177 685 1 1993 Davis et al 364 443 5 213 555 5 1993 Hood etal 482 57 SPEED 15 NEXT TURN 4 12 STONE WAY US005450325A Patent Number 5 450 325 4 Date of Patent Sep 12 1995 5 243 528 9 1993 Lefebvre 364 449 OTHER PUBLICATIONS User manual for Polar CycloVantage describing com munication between Cyclocomputer and general pur pose computer 1989 Pp 66 70 from Jan 1991 issue of American Bicyclist showing features of currently available Cyclocomput ers Primary Examiner Kevin J Teska Assistant Examiner Susan Wieland Attorney Agent or Firm Graybeal Jackson Haley amp Johnson 57 ABSTRACT A cyclocomputer for use on a bicycle displays route instructions stored in the cyclocomputer displays two dimensional graphs on the face of the cyclocomputer and is capable of exporting and importing information to and from other computers or cyclocomputers The route instructions may be displayed with symbols such as left arrow right arrow and up arrow or with alpha numeric characters The displayed instruction is ad vanced to the next instruction automatically when a predetermined distance has been measured by the odometer or by the press of a button Button presses may advance or review the displayed instructions The distance to the next instruction point is constantly dis played Impor
8. United States Patent Rodriguez 54 ROUTE DIRECTIONS DISPLAY SYSTEM 76 Inventor Angel L Rodriguez 4219 Baker Ave NW Seattle Wash 98107 21 Appl No 848 308 22 Filed Mar 9 1992 51 GES 06 15 50 52 364 444 364 443 364 424 01 340 995 58 Field of Search 364 424 01 424 04 364 443 444 449 468 460 561 708 709 1 340 995 56 References Cited U S PATENT DOCUMENTS 3 898 563 8 1975 Erisman 324 166 4 007 419 2 1977 Jasmine 324 166 4 156 190 5 1979 Chittenden 324 175 4 507 737 3 1985 LaSarge et al es 4 531 123 7 1985 Tagami et al 4 570 227 2 1986 Tanchi et al 364 444 4 638 448 1 1987 Cuvelier et al 364 565 4 682 287 7 1987 Mizuno et al 364 561 4 774 671 9 1988 Itoh et al 364 449 4 819 174 4 1989 Furuno et al 364 444 4 862 395 8 1989 Fey etal 364 561 4 881 187 11 1989 Read 364 565 4 976 424 11 1990 Sargeant et al 272 13 4 977 509 12 1990 Pitchford et al 364 449 4 992 947 2 1991 Nimura et al 364 444 4 999 783 3 1991 Tenmoku et al 364 450 5 016 007 5 1991 Iihoshi et al 364 449 5 031 104 7 1991 Ikeda et al 364 449 5 043 902 8 1991 Yokoyama et al 340 995 5 121 326 6 1992 et al 364 449 5 172 3
9. ated at the cyclocomputer or imported from another computer the number of instructions is limited only by the available memory in the cyclocomputer In the preferred embodiment the cyclocomputer includes a feature which allows the distance from one instruction point to the next to be measured when the route is ridden by the route describer See FIG 8 The route describer pushes a button at each instruction point to record in the memory of the cyclocomputer the distance from the last instruction point and or the total distance from the starting point This data on distances for each instruction point may then be exported to the general purpose computer for editing and formatting to create a complete set of route instructions The instruc tion point distance numbers and or the instructions may also be transferred from one cyclocomputer to another Once a cyclocomputer is loaded with the route in structions the rider initiates the ride with the push of a button 2 See FIG 7 The computer displays the first ride instruction typically a starting location The rider again pushes a button 2 when the bicycle is at that loca tion to start the trip odometer at zero At any point if the rider takes a side trip or a shortcut or if the distance measurement from either the odometer or the stored route instructions is inaccurate the rider can reset the trip odometer to the appropriate point by pressing a button 2 when the bicycle is along side an ins
10. c tions storage means 5 15 20 25 30 35 45 50 55 60 65 8 15 The device of claim 14 wherein the importing means comprises a a plurality of electrical wires 16 The device of claim 14 wherein the importing means comprises a transmitting means coupled to the computer for transmitting electromagnetic radiation through free space and b means coupled to the cyclocomputer for receiv ing the transmitted electromagnetic radiation 17 The device of claim 2 further comprising a importing means for importing information from a computer and b storage means for storing the imported informa tion 18 The device of claim 17 wherein the importing means comprises a transmitting means coupled to the computer for transmitting electromagnetic radiation through free space and b means coupled to the storage means for receiv ing the transmitted electromagnetic radiation 19 The device of claim 17 wherein the information comprises a information for calibrating an odometer function to the wheel size 20 The device of claim 17 wherein the information comprises a route instructions 21 The device of claim 17 wherein the importing means comprises a a plurality of electrical wires 22 A cyclocomputer for a bicycle comprising a a display to present two dimensional graphs show ing variation of one of the variables speed altitude cadence heart rate
11. cation between cyclocomputers can be accomplished by placing them adjacent to each other In addition an infrared transmitter 9 plugged into an RS 232 serial port of a general purpose computer 10 can be placed in a location where it can transmit to many bicycle cy clocomputers all at one time allowing all of the cy clocomputers to be loaded with route descriptions all at one time In the preferred embodiment the cyclocomputer can be set so that importing from a computer requires a password to prevent others from intentionally or inad vertently changing the route instructions or other stored information in the cyclocomputer All of the components required to build the invention are well known Wheel rotation and crank rotation sensors preferably consisting of a magnet 11 mounted on the spokes and a reed switch 12 mounted on the forks are widely available in the market place as are 20 25 30 35 40 45 heart rate temperature and altitude sensors All of 65 these have been incorporated into cyclocomputers that are widely available X Y addressable LCD displays are commonly available in pocket calculators and other 6 small electronic devices Infrared transmitting and re ceiving windows are well known in small electronic devices as are plugs and jacks for connecting multiple wires for direct wire connection Microprocessors and non volatile memories are well known in cyclocomput ers and other electronics Programmi
12. d over time The graph is marked to show each instruction point The embodi ment of FIG 2 also shows a sensor transmitter window for communicating via infrared radiation with another general purpose computer or cyclocomputer FIG 3 shows a plurality of cyclocomputers like that shown in FIG 2 positioned for receiving instructions or other data simultaneously from a single infrared trans mitter connected to a personal computer FIG 4 shows the wheel rotation sensor including a magnet and magnetic sensitive reed switch FIG 5 shows a block diagram of the electronic com ponents It is a typical design for a cyclocomputer ex cept for the addition of the infrared receiver and trans mitter FIG 6 shows the use of user control buttons B1 and B2 to access the principal functions and some subsidiary functions of the cyclocomputer B1 indicates a press of the first user button and B2 indicates a press of the second user button FIG 7 shows the use of user control buttons B1 B2 and B3 to access the subsidiary functions within the Instructions function 2 indicates two quick presses in succession of button B3 and B2 3 sec indicates a three second press of button B2 FIG 8 shows the use of user control buttons to access all of the subsidiary functions within the Record func tion FIG 9 shows the use of user control buttons to access all of the subsidiary functions within the Setup function FIG 10 shows the logic flow for th
13. e display and updating of route instructions DETAILED DESCRIPTION In the preferred embodiment route instructions are edited and formatted on a personal computer to appear as line by line instructions on the cyclocomputer 1 For a cyclocomputer that can display 25 characters on a line an example of an edited set of route instructions as it appears on the screen of a personal computer would be DUCKS RIDE 0 0 ST GAS WORKS PARK 0 0 L PACIFIC AV N 1 2 R STONE WAY 3 4 STONE WAY 5 6 L 50TH ST 6 8 RY PHINNEY AV 11 7 R YESLER WY 12 1 GOOD EATS HERE 13 7 X GREEN LAKE WY N 15 8 R N 34TH ST 19 6 L GAS WORKS PARK In the above example ST means start R means turn right L means turn left RY means go right at the Y X means cross C means continue and asterisk means point of interest The buttons on the cyclocomputer 2 can be used to generate all the characters required for the route in structions Because it is inconvenient for the user to scroll through 40 different alpha numeric characters when selecting the direction abbreviation designation as shown above R L ST RY LY X or C the interface scrolls through merely this list of designations An alter native embodiment might simply allow a right arrow a 15 20 25 35 40 45 50 55 65 4 left arrow and a straight up arrow a set of designa tions which is simple to scroll through and select Whether the route instructions are cre
14. in the housing for storing the predeter mined route instructions c means within the housing for communicating a predetermined route instruction to the rider and d means for advancing to the next predetermined route instruction e importing means for importing information from a computer the importing means including el transmitting means coupled to the computer for transmitting electromagnetic radiation through free space and e2 means coupled to the storage means for re ceiving the transmitted electromagnetic radia tion and f storage means for storing the imported informa tion 26 A device for storing a sequence of predetermined route instructions and communicating them to a bicycle rider comprising a housing for mounting a bicycle b means within the housing for storing the predeter mined route instructions 5 10 20 25 30 35 45 50 55 65 10 means within the housing for communicating a predetermined route instruction to the rider d means for advancing to the next predetermined route instruction the means for advancing the in struction including d1 odometer means d2 means for storing a distance value associated with each route instruction d3 means for comparing the stored distance value with distance measured by the odometer and producing a comparison value and d4 means for advancing the communicated in struction to the next i
15. ithin the housing for storing the predeter mined route instructions and associated with each route instruction a distance value c means within the housing for communicating a predetermined route instruction to the rider d odometer means e means for comparing the stored distance value with distance measured by the odometer and f means for advancing the communicated instruc tion to the next predetermined route instruction when the comparison between the measured dis tance and the stored distance value reaches a cer tain number 3 The device of claim 2 wherein the means for com municating the route instruction comprises a means for announcing an audio instruction 4 The device of claim 2 wherein the housing has a display and the means for communicating the route instruction comprises a means for displaying the communicated instruc tion on the display 5 The device of claim 2 further comprising a means responsive to the odometer for calculating the current speed 5 means for calculating the remaining distance to the next instruction point and c means for calculating and communicating the remaining time to the next instruction point at the current speed 6 The device of claim 5 wherein the means for com municating the remaining time to the next instruction point comprises a means for announcing one or more sounds at one or more predetermined times prior to expected arrival at the next
16. nfrared or radio In a preferred form of the invention infrared is employed and the information can be im ported to many cyclocomputers at one time all in close proximity to the transmitter for loading a batch of cy clocomputers all with the same route instructions Another aspect of the invention allows information such as distance numbers associated with each instruc tion point route instructions and data gathered from a ride such as speed time or altitude distance to be ex ported from a cyclocomputer to a general purpose com puter for editing analysis display or re exporting to other cyclocomputers The information transfer can also be made directly from one cyclocomputer to an other A still further aspect of the invention allows data contained within the cyclocomputer to be displayed in a two dimensional graph on the face of the computer by the use of an x y coordinate addressable LCD dis play The locations of points associated with each route instruction are displayed on the graphs BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a front elevation of a cyclocomputer with a screen displaying an instruction the distance to the next instruction point and the current speed It also shows a form of wire connection to either a general purpose computer or another cyclocomputer FIG 2 is a view of an alternative embodiment of the cyclocomputer of FIG 1 with the screen showing a 5 450 325 3 two dimensional graph of spee
17. ng of the features and the computations required to implement the above described features is straight forward and could be ac complished by any trained programmer Placement of voice synthesizer electronics and a speaker is described in U S Pat No 4 638 448 The preferred embodiment for the cyclocomputer is relatively small with a screen of about 2 by 1 and a small number of buttons as shown in FIGS 1 and 2 It is created with existing components and a custom made case An alternative embodiment has been created using a pocket sized general purpose computer with an x y addressable LCD display specifically the Hewlett Packard HP95LX The computer has been pro grammed to communicate through an RS 232 serial port to the reed switch 12 for counting wheel rotations For importing or exporting data the HP95LX has an infra red communications window Some of the uses of the disclosed cyclocomputer include the following Riders in a new area may go toa local bike shop to import into their cyclocomputer one or more routes to ride Book publishers may include a disk with routes ready to load into a general purpose computer and export to the cyclocomputer Bicycle tour companies may export the day s ride to all of the tour participants Bicycle clubs may publish recom mended rides a computer bulletin board for import ing into a general purpose computer with a modem and then exporting to the cyclocomputer To promote bicy cle to
18. nstruction when the com parison value reaches a certain number and e importing means for importing route instructions from a computer to be stored in the route instruc tions storage means the importing means includ ing el transmitting means coupled to the computer for transmitting electromagnetic radiation through free space to a plurality of receiver means all at one time and e2 means coupled to the cyclocomputer for receiving transmitted electromagnetic radiation
19. r a train ing ride or a competition recorded data from the ride can be exported to a computer to be manipulated or analyzed for various purposes See FIG 9 One such purpose might be the comparison of data from various competitors to determine winners Another would be the creation of a personal tour log or training record A third might be to modify the route instructions or dis tance numbers for subsequent importing to one or more cyclocomputers for future rides on the same route In the preferred embodiment at least two lines are available for route instructions so the instructions 1 can be long and detailed If the instruction or similar com ment is longer than this or in an alternative embodi ment where only one line is available additional lines of an instruction can be displayed by pressing a button 2 Communication with other general purpose comput ers or cyclocomputers for exporting or importing infor mation can be accomplished either with a multiple wire connection 6 or by radio or infrared electromagnetic radiation The preferred embodiment uses infrared which is transmitted and received with an I R photo emitter diode and an I R sensor diode located behind a small window on the cyclocomputer 7 Such infrared communication means are well known for remote tele vision transmitters and other communications between devices such as electronic name address and telephone number record systems Using infrared means commu ni
20. rip distance total time trip time clock time stop watch functions and count down timer With additional internal electronics some cyclocomputers can also display altitude rate of climb or descent and temperature With additional sensors located at the crank or on the rider some cyclocomput ers can display pedaling cadence whether cadence is above or below a set point heart rate whether heart rate is above or below a set point and total time that heart rate is within target zones Various cyclocomput ers feature audio beeps or synthesized voice cues to report some of this information to the rider Various cyclocomputers can record any of the above data and replay the recorded data on the instrument face At least one of them can also export this data to a computer for further analysis or display The odometer function of each cyclocomputer requires calibration to the wheel size of the bicycle This is accomplished by pressing buttons on the cyclocomputer and either riding the bicycle over a measured distance or inputting the wheel size Many cyclists tour for pleasure and enjoy discovering new routes that they have not previously ridden Cy cling clubs and cycling magazines frequently publish route descriptions either in map form or a sequence of written instructions for others to follow The cyclist typically carries the instructions in paper form in a pocket and occasionally stops to consult the instruc tions an inconvenient
21. ting information may be accomplished with an infrared link which communicates to many cyclocomputers at one time Recorded data such as speed pedal cadence or heart rate may be displayed over distance or time with the graphs being marked for each instruction point 26 Claims 8 Drawing Sheets U S Patent ___ Sep 12 1995 Sheet 1 of 8 5 450 325 FIG 2 Sheet 2 of 8 5 450 325 Sep 12 1995 US Patent FIG 3 U S Patent Sep 12 1995 Sheet 3 of 8 5 450 325 a DATA BUS USER BUTTONS age CPU B2 BS CONTROL WHEEL ROTATION SENSOR ELECTRICAL INFRARED RECEIVER 5 Homi INFRARED TRANSMITTER DISPLAY Sheet 4 of 8 5 450 325 Sep 12 1995 U S Patent 6 Sid 335 31135 32071510 03345 55 03395 lt 4 8 915 325 040584 al 2 913 335 SNOILLONYLSNI 5 HOLVMdOLS zg 135 zg 4 WLOL 28 didl lt s5 LX4N lt 35 SONVIS Id t 7 E a i T N lt lt ____ _ 2 3533 28 28 03345 Dis Sheet 5 of 8 5 450 325 Sep 12 1995 U S Patent 28 3215 T3SHM SLVYaI IVD 0179 JONVLSIG NOLLONUYLSNI YNOLIG HOLVW OL AVIdSIG YALIWOGO 323353 5 la 0935 amp NOLLONYLSNI _2 NOLLONYLSNI 8 SNOIASYd
22. truction point If the rider believes that the route instructions contain an accurate distance and his wheel size calibration is inaccurate he can press a button which instructs the cyclocomputer to recalibrate the wheel size so that the reported odometer distance will match the distance stated in the route instructions See FIG 7 To tell the rider when the next instruction point will be reached in the preferred embodiment the display indicates the distance remaining to the instruction point 3 One can watch this number approach zero and be forewarned accordingly See FIG 10 Also the device will make a warning sound one or more preset times calculated with current speed 4 from the instruction point Alternatively the device might play a synthe sized voice prompt to alert the rider that an instruction point is coming up soon and it might further state the turn instructions in a synthesized voice such as right or left In an alternative embodiment the prompt which indicates that an instruction point is approaching is based on remaining distance rather than remaining time In the preferred embodiment once the instruction point is reached as measured by the odometer the next instruction will automatically appear See FIG 10 Alternatively if the cyclocomputer has no odometer function or the odometer is not working the arrival at an instruction point can be communicated by the rider to the cyclocomputer by the press of
23. urs government tourism departments may send prospective visitors route descriptions on disk Friends may share routes that they have developed Magazines may publish routes in a printed format suitable for entry into a general purpose computer or directly into a cy clocomputer Numerous alterations and modifications of the em bodiments described above will become apparent to those skilled in the art after having read the above dis closure It is therefore intended that the following claims be interpreted to cover all such alterations and modifications as fall within the true spirit and scope of the invention I claim 1 An odometer for use on a wheeled vehicle com prising a means for sensing each rotation of a rotating part which rotates a fixed number of times with each rotation of a wheel b means for counting sensations of rotation c means for causing the odometer to begin counting sensations of rotation d means for inputting to the odometer the distance travelled from the commencement of counting sensations of rotation and e means for using the distance travelled and number of rotations counted over that distance to subse quently calculate a second distance travelled from second counted number of sensations of rotation 2 A device for storing predetermined route instruc tions and communicating them to a bicycle rider com prising a a housing for mounting on a bicycle 5 450 325 7 means w
24. visual cue on the display an audio voice cue or other sensory signal Once a set of route instructions with distance num bers is loaded into the cyclocomputer the wheel size calibration number stored in the memory of the cy clocomputer can be revised to be more accurate upon command from the rider If when the rider reaches an instruction point after the starting point the next in struction does not appear automatically at the correct point the rider can press buttons to instruct the cy clocomputer to consider the distance traveled to be the same as the distance number from the instruction set and recalibrate the correct wheel size accordingly The same feature can be used to empirically calibrate the wheel size by entering a set of route instructions with two instruction points a known distance apart such as one mile and then riding the known distance typically a measured mile along a road or bicycle path Appropri ate button presses at the beginning and end of the mea sured distance will produce a highly accurate empiri cally measured wheel size calibration The invention also allows route instructions and dis tance numbers for each instruction to be imported from a general purpose computer or another cyclocomputer In an alternative embodiment wheel size calibration information may also be imported The importing link may be established with electrical wires between the devices or by electromagnetic communication such as i
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