Cambridge 303 LCD User Manual (in PDF)
Contents
1. February 2003 Cambridge P N MA 015 Page 4 of 15 Scroll through 6 screens showing wind glide altitude and glider performance LEFT RIGHT Screens to the RIGHT of HOME are mostly for selecting Navigation Points Screens to the LEFT of HOME have a variety of functions Except on the HOME screen UP DOWN keys usually a Scroll through Navigation points RIGHT of HOME or b Scroll through Miscellaneous data LEFT of HOME or c Scroll through letters for spelling Pilot name or d Increase or decrease a number 2 4 First Flight Your flight will automatically be recorded so you might as well put your name on the flight log In the process you will learn how to navigate the LCD display screens After powering up the instrument and setting the DDV Altimeter press the LEFT arrow key until you see the words Select Pilot 1 Pilots Press GO then press DOWN until you see the words New Pilot on the screen Press GO again You ll see a message Enter Name gt lt Preference The hint is to press the RIGHT arrow key to enter your name Once you press RIGHT you will see New Pilot Scroll UP or DOWN to change the underlined character Press RIGHT to move to the next character Keep moving the underline cursor Eventually you will see a place to enter your preferences for instrument behavior Keep going until you see Goal Height nnn feet Scroll UP until nnn is 1000 ft Press GO to exit the New Pilot entry screens Answ2. Page 13 of 15 D3 U3 Waypoint Information amp Ground Speed This screen is useful in two rare situations This is why it is equally accessible with UP or DOWN keys The first case is when you are about to land off field If you are lucky the Waypoint database will include information on preferred landing direction tower frequency or other useful information The second case is in wave flying conditions where the headwind may exceed the glider s true airspeed Component wind data is useless when this happens Looking at GPS Ground Speed V helps you figure out what the heck is going on 5 Messages and Warnings 5 1 Waypoint Control Zone Messages The 303 NAV defines two circles around the Active Waypoint Preference for the radius of each circle can be set differently for each pilot The Approaching radius defaults to 3 Km 1 6 NMi The Arrival radius defaults to 0 5 Km 0 27 NMi When the glider moves from outside to inside the Approaching radius the DDV makes 2 short loud beeps and the message Approaching is displayed for a few seconds on the HOME screen On other screens the M Message annunciator is lit When you press GO the 303 NAV jumps to the HOME screen and shows the message When the glider moves from outside to inside the Arrival radius the DDV makes one long loud beep and the message Arrival is displayed for a few seconds Approaching _ FAI Sector me
3. long Preferences can be selected for the following quantities Units of altitude airspeed distance climb rate and temperature Goal Height and speed to fly error threshold for audio warning Radius at which Approaching and Arrival warnings are given Section 5 1 Audio sink tone in Climb mode YES or NO Choice of Variometer pointer behavior Section 3 6 Pilot name and Preferences are stored when the GO button is pressed L6 Edit Polar This is useful if your glider has 2 possible wingspans and therefore 2 different polars See the Utility Program Section in the 302 DDV Manual for definitions Press GO to store the new polar and return to the HOME screen Note Polar can t be changed if Utility program Configuration Lock is ON UP or DOWN from the HOME Screen A cross country gliding flight has several phases Data displayed for inter thermal flight may not be very useful for the final glide Ridge soaring is a special situation for which the Fast component wind is useful Flying in mountain wave also presents unique challenges Sometimes during cruise you may wish to know the average airmass motion Average Netto or the glider s effective L D We could present ALL the information ALL the time but the LCD screen would be filled with a jumble of tiny confusing numbers 303 NAV Manual February 2003 Cambridge P N MA 015 Page 12 of 15 Cambridge has a different way of presenting a large amount of data We have arr
4. square 14 mm 0 55 behind panel Mounts in 57 mm 2 25 round hole Weight 85 grams 3 oz Power 20 ma at 5 Volts 0 1 watt Connection 6 conductor modular cable with RJ 11 connector Cambridge Data Bus I 2C 150 Kbit sec Database Up to 1500 Navigation Points 303 NAV Manual February 2003 Cambridge P N MA 015 Page 15 of 15
5. the upper right Differential Altitude required Dif is computed using Vector Wind and current MacCready setting R4 Turnpoints sorted by Alphabetic Spelling The DOWN key scrolls A gt Z The UP key scrolls Z gt A Press and hold the key to scroll through the Turnpoints Tap either key more than 3 times sec to skip over 10 Turnpoints R5 Turnpoints sorted by ID Waypoints with T S or F attributes are sorted by their numeric ID Tap the UP or DOWN key more than 3 times second to skip over 10 Turnpoints 303 NAV Manual February 2003 Cambridge P N MA 015 Page 10 of 15 R6 Edit Task This is where you edit Turnpoint lists for Tasks and Declarations Lists are managed in R2 Press GO to see the list from which you can select T P 0 Press DOWN to scroll through the Turnpoint list by ID to the one you want for the starting point of your task Press RIGHT to see the list for the first task Turnpoint Continue until you have completed the task including the finish point The number at the bottom of R6 is the total distance from Task Point 0 to the currently selected Turnpoint Don t press GO until you are done making the list If you answer YES to the question Declare Task the list date amp time will be declared in the next flight log If you answer YES to the question Save Changes a new Task or edited Task will be saved Otherwise the pre change Task is retained End of Task is displayed between the first an
6. variometer pointer shows what a Total Energy variometer would show at the glider s best glide speed A Super Netto variometer is sometimes known as a Relative variometer Most pilots prefer a Super Netto variometer because it gives the glider s actual climb rate in a thermal while still showing the climb rate obtainable when slowing from fast cruising speed to thermalling speed Note The DDV averager is total energy compensated The DDV audio is ALWAYS configured as a Super Netto variometer 4 Primary Screens Power On Screens Instrument firmware version and configuration are shown at power on If power is already on pressing the 303 NAV ON button displays Pilot Name and Goal Height Go to Screen L5 Pilot Select to change these settings HOME Screen The HOME screen shows the Active Waypoint Name and the Differential Altitude required to reach the Goal Waypoint at the Goal Height abbreviated Diff If you are flying a task the Goal Waypoint is the last Waypoint of the task If you are not flying a task the Goal Waypoint is the same as the Active Waypoint 303 NAV Manual February 2003 Cambridge P N MA 015 Page 9 of 15 The Differential Altitude required includes the altitude you would gain by slowing from your present speed to the best glide speed Vm Including Kinetic Energy in the calculation makes displayed Differential altitude independent of your cruise speed The large arrow shows the difference between the glider
7. 303 Navigation Display Manual 302 DDV Version 2 6 303 NAV Version 0 0 2 Firmware by Phil Schlosser text by Dave Ellis ON G exe GPS NAV sort lgs p gt fi m Fi 302 DDV Actual Size 303 NAV Actual Size Warranty All Cambridge Aero Instruments products are guaranteed against defects for TWO YEARS from date of original purchase when used in gliders The warranty is limited to faulty workmanship and or materials The unit must be returned to the factory or to an authorized repair station This warranty is void if failure is due to accident mishandling or repairs performed by unauthorized persons Cambridge Aero Instruments Inc 1565 Dancy Blvd Horn Lake MS 38637 Tel 662 280 7610 Fax 662 280 7609 www cambridge aero com Table of Contents Section Page 1 Introduction 2 2 Getting Started 3 2 1 The Waypoint Database 2 2 The Screen Map 2 3 What the keys do 4 2 4 First flight 5 3 Terminology amp Glossary 6 3 1 Ground Track Bearing and Heading 3 2 Altitude Elevation and Height 3 3 Navigation Points 7 3 4 Attributes 8 3 5 Winds 3 6 Variometer Pointer behavior 9 4 Primary Screens 9 5 Messages and Warnings 14 5 1 Waypoint Control Zone Messages 5 2 Warning Messages 15 6 Specifications 15 1 Introduction to the Cambridge 303 Navigation Display This manual covers installation and operation of the Cambridge 303 NAV display The document is complete but concise Do not
8. Task Course Lines Fa Arrival 303 NAV Manual February 2003 Cambridge P N MA 015 Page 14 of 15 If a Task is active the 303 NAV gives an additional message when the glider enters the FAI Photo Sector for the Active Task Turnpoint Three loud short beeps are accompanied by the message In Sector on the 303 HOME screen The In Sector message takes priority over both the Approaching and Arrival messages The outer boundary of the DDV FAI Sector is at the Approaching radius 5 2 Warning Messages The Cambridge 300 system provides audio warning beeps for potentially dangerous situations Please see the DDV Manual for installation of the necessary switches operational details and description of audio sounds The 303 NAV provides warning messages that appear on all screens and persist as long as a situation persists Normally the message is canceled when the pilot takes corrective action However each warning sound and message may also be canceled by pressing the 303 GO key or the DDV control knob If Airorakes are open as the glider reaches takeoff airspeed the message Close Airbrakes is shown If Airorakes are opened during flight and the landing gear has not been extended the message Extend Landing Gear is shown If airspeed falls below the threshold set on DDV Screen 8 the message Airspeed Too Low is shown 6 Specifications Size 66 x 66 mm 2 6 x 2 6
9. age shown on the DDV falls below this number experienced cross country pilots leave a thermal and cruise to the next one The upper right number is the effective glide angle L D This is computed as GPS ground speed divided by the glider s climb rate Upwind flight will show a lower effective glide angle than downwind flight As with other performance numbers the effective glide angle is averaged over 30 seconds Netto is variometer reading glider sink rate as determined from the polar Netto represents airmass vertical motion The lower line on this screen shows Netto averaged over the last 30 seconds This is useful during the final glide as it shows whether or not you are beating the glide computer s estimate of altitude required to reach the goal point D1 U5 Differential Altitude Required Vector and Relative Wind This screen may be useful on a final glide because it combines Relative Wind and the altitude required for the glide D2 U4 Differential Altitude Required based on Averaged Component Wind This screen is useful on long straight final glides Due to friction winds aloft are stronger than winds near the earth s surface Vector Wind obtained by circling at high altitude does not update during straight flight towards the finish line The Average Component wind is updated during straight flight and is therefore better than Vector Wind under this special circumstance 303 NAV Manual February 2003 Cambridge P N MA 015
10. anged the 303 NAV screens UP and DOWN from HOME so each screen is appropriate for a particular gliding situation Each screen shows the big GPS Navigation Arrow so you always know how to turn towards the Active Waypoint GPS Ground Track and Distance amp Bearing to the Active Waypoint are also shown on each of these screens As with all other 303 NAV screens pressing GO returns HOME from any of these screens It s easy to navigate both glider and instrument back HOME U1 D5 Three flavors of Wind You get here by pressing UP once smart or DOWN 5 times dumb The upper line shows the Fast Component Wind HW TW It updates every second Watch it You will learn a lot about thermal ridge and wave lift if you observe the associated wind patterns The lower line shows Vector Wind and the relationship of this wind to the glider s track over the ground The small arrow shows the direction from which the wind is coming relative to the glider s Track over the ground We call this the Relative Wind The number to the right of the arrow is the precise wind direction relative to the glider s track 180 means a pure tailwind Observing Relative Wind helps you understand cloud streets and convergence zones U2 D4 Climb and Cruise Performance numbers This is a collection of numbers that measure your gliding performance The upper left number is the average climb rate since the beginning of circling flight When the 30 second climb aver
11. butes are sorted by distance from your current position H HOME At power on the 303 NAV navigates to the Waypoint with the H attribute Active Waypoint The HOME screen shows the Active Waypoint name together with bearing and distance to it Selected Waypoint Many different 303 NAV screens display lists of Waypoints You scroll through a list to select a Waypoint Except when you re editing a Task a Selected Waypoint becomes the Active Waypoint when the GO key is pressed 3 5 Winds The usefulness of information provided by the 303 NAV is enhanced because the instrument automatically measures the wind in the airmass through which the glider is flying The 303 NAV uses and displays no less than 4 different kinds of wind information Fast Component Wind HW TW Once per second the 303 NAV measures Indicated Airspeed IAS applies corrections for Altitude and Outside Air Temperature Calculates True Airspeed TAS and computes the difference between TAS and GPS Groundspeed GS If TAS greater than GS the result is a Headwind HW If TAS less than GS the result is a Tailwind TW For brevity we call this quantity HW TW the wind in the direction of flight The 303 NAV displays HW TW as HW or TW followed by wind strength in knots or Km Hr Average HW TW The glide angle with a Headwind HW is lower than with a tailwind TW The 303 NAV Differential Altitude required based on Average HW TW is shown on Screen D2 U4 HW TW a
12. d last Turnpoint in the Database To make a null task no points select End of Task as Point 0 To delete a Declaration you must declare a null Task A non deleted Declaration automatically appears as a default task This makes it hard to accidentally delete a Declaration R6 can also be used to select from a large Waypoint database a short list of Turnpoints points relevant to a recreational flight for the day R2 becomes just a short list from which you can select a Turnpoint without declaring or starting a task We have done our best to make creating editing and stepping through a Task simple and intuitive You are probably thinking Surely you jest sire Please please practice this stuff on the ground before committing aviation LEFT of the HOME Screen L1 Mark Lift Press GO to mark your current position and altitude The Lift Point becomes Active on the HOME screen Use R1 to toggle between a Lift Point and another point Lift Points go away when the instrument is turned off Note Diff Altitude to a marked point includes Goal Height see Section 3 2 L2 GPS and other Data The first L2 screen shows current position GPS Latitude Scroll down to see GPS Longitude GPS Altitude Pressure Altitude Assumes Barometric pressure 1013 2 mbar or 29 92 H20 Engine Noise Level ENL Range 0 999 Engine ON at 500 Note ENL responds to audio sounds from the internal speaker Instruments approved for motorglider
13. e HOME screen shows the Active Waypoint name and the difference between your altitude and the altitude you need to land there safely The 303 NAV U2 D4 De Fee Primary Screen Map U24 Performance numbers Version 2 5 Component Vector September 2002 u13 and Relative Wind Edit Select Wing Misc Mark Select a Waypoint Edit Polar Pilot Load Data Lift Task Differential Altitude D1 U5 Vector amp Relative Wind Diff Altitude based on D2 U4 Component wind Waypoint data U3 D3 GPS Ground Speed V 2 3 What the keys do There are 6 keys on the 303 NAV UP DOWN LEFT RIGHT GO and ON There are three possible ways to use the keys Press a key for a short time Press amp hold a key for more than 1 sec For auto scroll timer reset and OFF Press UP DOWN keys more than 3 times second to skip over Waypoints ON The ON key turns the instrument on if power is connected to DDV pin 2 Press amp Hold the ON key for more than 3 seconds to turn the DDV off Pressing the ON key during flight puts a Pilot Event PEV mark in the flight log Pilot Name and Goal Height screens are displayed after a PEV is marked GO Pressing the GO key several times ALWAYS takes you to the HOME screen Press the GO key from the HOME screen to show elapsed flight time Press amp Hold the GO key from the HOME screen to reset elapsed time Note Flight time resets automatically each time you take off UP DOWN from the HOME screen 303 NAV Manual
14. er Yes to the question Save Name Answer Yes to the question Make Active Press GO to take you back to the HOME Screen This is about as complicated as the 303 NAV gets Please don t be intimidated this gadget is supposed to make glider flying more fun If you have a database loaded you will see the Waypoint with the H attribute hopefully your gliderport on the 303 NAV HOME screen When you fly the big arrow on the LCD screen shows the direction to turn to go back to the gliderport The top line on the LCD screen shows the difference between your altitude and what you need to arrive safely back at the gliderport As you get close to the gliderport the 303 NAV gives you on screen messages and audio beeps for Approach and Arrival It is just that simple From the 303 NAV HOME screen Press GO to see the elapsed time since takeoff The instrument remembers flight time so you can update your logbook after landing There is much much more to the 303 NAV but you can now fly safely with it Don t look here for detailed discussion on tactics for cross country and competitive gliding there are plenty of good books on those subjects 303 NAV Manual February 2003 Cambridge P N MA 015 Page 5 of 15 3 Terminology and Glossary Gliding is a specialized sport with its own weird terminology Here are some words and phrases you ll find in this Manual 3 1 Ground Track Bearing and Heading North Waypoint Bearing 22 Track 30 An
15. expect to understand the entire instrument by reading the Manual once We suggest studying section 2 Getting Started and skim through the rest of the text Fly with the 303 NAV for a while and return to this document with specific topics in mind At Cambridge we listen to our customers and fly with the instruments we build The Cambridge 303 NAV embodies 20 years experience in design and construction of more than 5000 Variometers Glide Computers and GPS Flight Recorders We trust you will enjoy flying with it as much as we enjoy designing and building it for you 303 NAV Manual February 2003 Cambridge P N MA 015 Page 2 of 15 The 303 NAV display works only with the Cambridge 302 Direct Digital Variometer DDV Using 302 DDV sensors and computing power the 303 NAV combines GPS based Navigation wind measurement and Final Glide calculation in a single easily learned set of screens LCD screens on the Cambridge 302 DDV and 303 complement each other The DDV Home screen shows Altitude Averager MacCready setting and Speed Commands The 303 NAV Home screen shows Waypoint Name Distance to go Bearing to the Waypoint Ground Track and the difference between your current altitude and what you need to land safely at that Waypoint The Cambridge DDV and 303 NAV depend on Global Positioning System GPS signals for navigation wind and gliding performance measurement When compared with earlier Cambridge products full GPS integration make
16. gles in this diagram are Heading 45 defined relative to North lt Wind 90 Bearing is the angle of the line between the glider s position and the Waypoint Ground Track is the angle of the glider s flight path over the ground Heading is where the nose of the glider is pointed A crosswind as shown makes track and heading different 3 2 Altitude Elevation and Height Altitude is measured relative to Mean Sea Level MSL The glider s Altitude is what your Altimeter shows if MSL barometric pressure is correctly set Elevation The altitude of the ground at the Waypoint Goal Height Imagine a point in the sky directly above your gliderport called the Goal Point The 303 NAV displays the altitude you need to glide to this Goal Point in the sky Goal Height is typically set to 1000 feet If your glide ends at the Goal Height you have enough altitude to execute a normal landing pattern Glide Altitude The 303 NAV predicts the altitude you will lose getting from your present location to the Goal Point If you are flying a task the Glide Altitude is that which is required to fly to ALL the remaining task Turnpoints Otherwise Glide Altitude is that which you need to arrive safely at the Goal Point directly above the Active Waypoint 303 NAV Manual February 2003 Cambridge P N MA 015 Page 6 of 15 Differential Altitude Required The 302 DDV has a precision altimeter The 303 NAV displays the difference between you
17. must use an external audio speaker EPE Estimated Position Error UTC Date Month Day Year UTC Universal Time Coordinated time in Greenwich England 303 NAV Manual February 2003 Cambridge P N MA 015 Page 11 of 15 L3 GPS Satellite Signal data The upper line shows No 2D or 3D GPS fix amp of satellites used in view The lower line shows the satellite ID and Signal to Noise Ratio SNR The lower left digit shows satellite angle from North and azimuth Press DOWN key to see data from each in view satellite SNR should be above 50 for at least one satellite Check antenna location if this is not the case Only satellites with SNR greater than 35 are used for navigation This stuff keeps designers and other geeks happy L4 Water Ballast and Wing Loading The upper line shows water ballast as a of the maximum entered as part of the polar data Press UP or DOWN keys to change The number shown at the lower left is the Wing Loading in units specified on the second line of the screen L5 Select Pilot Press GO in the Primary screen to see the first pilot Press DOWN to scroll through the list of pilot names The Last entry in the Pilot Name list is New Pilot Press GO to select a pilot The next Screen reminds you to press gt to edit Name lt to edit Preferences Enter a pilots name by scrolling through the alphabet for each character in the name The pilot s first and last name can be up to 12 characters
18. r present Altitude and the altitude you need to glide to the Goal Point Differential Altitude Required is abbreviated as Diff on the 303 NAV HOME screen Present me Position Goal x Point Glide Altitude a WS A Goal Height Vv Goal Elevation ne Diff Altimeter Glide Altitude Goal Height Goal Elevation Note Goal Height is set in Pilot Preferences Screen L5 3 3 Waypoints The 303 NAV requires a database of Waypoints These are just carefully formatted computer text files Each Waypoint is one line of text Commas separate fields in the database 37 44 28 400N 072 40 880W 725F T Stowe VT ChurchSteepl 38 44 06 920N 072 49 820W 1470F TAH Sugarbush RW 22 NE End 39 44 24 500N 072 11 700W 1450F T W Danville Lake Narrow 1 2 3 4 5 6 7 Field Meaning Waypoint Index Latitude Degrees decimal minutes only N North S South Longitude W Western Hemisphere E Eastern Hemisphere Elevation F Feet M Meters Attributes Each point can have up to 6 attributes Waypoint Name Up to 12 characters Comment Field Up to 12 characters NOOR WD 303 NAV Manual February 2003 Cambridge P N MA 015 Page 7 of 15 3 4 Attributes T S and F Only Waypoints having Turnpoint T Start S or Finish F attributes can be included in Tasks Also only T S or F points are sorted by Spelling on screen R4 or ID on screen R5 A and L On screen R3 Waypoints having Airport A or Landable L attri
19. s the instruments cleaner and easier to learn The 303 NAV is further simplified because it has only those functions that pilots found most useful in our earlier instruments 2 Getting Started Refer to Section 2 amp Appendix B of the Cambridge DDV Manual for installation instructions The 303 cable plugs into the DDV 6 pin CAI Bus connector 2 1 The Waypoint Database of GPS Coordinates Operation of the Cambridge 303 Navigation Display 303 NAV requires a database of Waypoints with GPS coordinates and Elevations in the 302 DDV internal memory Up to1500 Waypoints can be stored Please refer to Section 4 of the 302 DDV manual to learn how a Waypoint Database is transferred to the DDV An excellent list of Waypoint databases contributed by volunteers is available at http acro harvard edu SOARING JL TP We guarantee frustration unless you have installed a Waypoint database 2 2 The Screen Map The bottom half of 303 NAV screens usually show Distance and Bearing to a Waypoint Glider Track over the ground and an arrow showing Bearing Track to the Active Waypoint The number of GPS satellites in view is also shown The top half of the screen shows information that depends on its position on the Screen Map shown on the next page Boxes show the number of times from the HOME screen that the relevant key UP DOWN LEFT RIGHT must be pushed to see the screen 303 NAV Manual February 2003 Cambridge P N MA 015 Page 3 of 15 Th
20. s track and the bearing to the Active Waypoint Turn in the direction of the arrow to fly towards the Waypoint The small dots at the lower right show the number of GPS satellites being used to determine your position With a good antenna location you should see 5 8 dots RIGHT of the HOME Screen R1 Last Point 15 Recent Active Waypoints and Lift Points are listed here The most recent point Last Point is at the top of the list Scroll DOWN to see earlier points Lift Points See screen L1 are Named by time and lift strength Press GO to make a Waypoint or Lift Point Active and return to the HOME screen R2 Task Turnpoint If a Task Turnpoint List has been created see Screen R6 screen R2 shows Task off Point 0 Press the UP key to see Start This Task Press GO to start the task The Start point Point 0 becomes the Active Waypoint Once a task has been started R2 shows the next Task Turnpoint Press GO to make this Turnpoint Active Use UP DOWN keys to review task Turnpoints and Stop Start or Resume a task If you make an off task Waypoint Active the R2 screen shows Resume Task Current Point Press GO to make the current Task Turnpoint active R3 Landable Waypoints by distance from current position The closest Landable Waypoint L or A attribute is shown Use the DOWN key to see other points sorted by increasing distance Differential Altitude required to reach the Landable Waypoint is shown at
21. veraged over 30 seconds is used rather than Fast HW TW because it makes the Differential Altitude Required Diff more stable The 303 NAV displays Average HW TW as Avg HW or Avg TW followed by wind strength in knots or Km Hr 303 NAV Manual February 2003 Cambridge P N MA 015 Page 8 of 15 Wind Direction and Strength Vector Wind The 303 NAV averages HW TW measurements made at different tracks to compute the Vector Wind The Vector Wind is updated only when the glider turns at least 30 degrees in a short time Vector Wind is shown as ddd ss 3 digits for direction and 2 digits for strength Relative Wind Direction This is the direction of the wind relative to the glider s GPS Track over the ground The 303 NAV displays Relative Wind as an arrow that shows graphically the approximate direction from which the wind is blowing on the glider This is followed by a three digit number that gives precisely wind direction relative to the glider s track 3 6 Variometer Pointer Function 302 Variometer pointer function can be selected in screen L5 as a Pilot Preference The choices are Total Energy The variometer pointer shows the change in the glider s total energy Total Energy Kinetic Energy airspeed Potential Energy Altitude Netto The variometer pointer shows the airmass vertical motion This is useful in cruise mode because positive airmass motion indicates improved glide angle and vice versa Super Netto The
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