Kestrel® Pocket Weather® Tracker with Horus® ATRAG™ Ballistic
Contents
1. Use g and 9 to adjust the value Capture mode When DoF is highlighted press to enter the DoF screen Use Q amp Z to scroll to Capture Press to enter into the capture mode Face the back of the Kestrel directly toward the target and press The data collected in capture mode will automatically adjust the DoF value in the Target screen Inclination Angle Inclination angle is the angle between the target and the horizontal as seen by the shooter This variable is expressed in the Target screen as Ideg or Icos where Ideg is in degrees and Icos is the cosine angle These can be manually adjusted by highlighting one and using the QJ and 4 to change the value Changing one will automatically change the other appropriately Target Speed Use WW or to highlight TS Use g and Be adjust the value Target Speed Estimator This function estimates the speed of a target based on range movement and time When TS is highlighted press C button to enter Speed of Motion screen Speed of motion Omph miles per hour Estimate Use A amp E to highlight Estimate and press C to enter Speed Estimate screen Use WW or ED to highlight a parameter Use g and Bx adjust values for each parameter When all parameters are set press to escape An Accept screen will appear scroll to Yes if you would like to accept values Use C to select t2. 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 RemV 2355 2169 1991 1823 1666 1520 1388 1272 1177 1101 1042 995 955 920 888 860 833 808 784 761 739 718 698 679 660 642 624 607 590 574 558 542 527 512 498 484 470 RemE 2155 1828 1541 1291 1078 897 748 629 538 471 422 385 354 329 307 287 269 253 239 225 212 201 189 179 169 160 151 143 135 128 ToF 0 134 0 279 0 437 0 609 0 798 1 004 1 230 1 477 1 745 2 034 2 340 2 662 3 000 3 350 3 712 4 088 4 477 4 876 5 287 5 713 6 152 6 602 7 063 7 539 8 031 8 537 9 055 9 588 10 13 10 70 11 28 11 88 12 49 13 12 13 76 14 43 15 12 MaxO 0 87 3 79 9 27 18 00 30 98 48 99 73 51 106 0 148 0 201 0 266 2 344 5 437 3 545 3 669 7 812 3 973 9 1155 1359 1586 1839 2118 2424 2762 3134 3542 3985 4468 4990 5560 6182 6855 7581 8363 9206 10119 11110 Specifications Target Gun Environment Feature Abbreviation Units Minimum Maximum Active Targets N A A through E 1 5 Yards 25 000 TIN w meters 23 3658 o clock 1 12 Wind Direction wo EA z mph o 50 m s o 22 Wind Speed WS1 or w52 km h 0 80 fps 0 73 Knots o 43 degrees 0 360 Direction of Fire DoF Inclination Angle Tdeg degrees o 60 Inclination Cosine cos no units 1000 0
3. in 10 20 25 50 or 100 units of measure yards or meters Press to exit Range Increment screen 17 Note The Range Card will display range values up to 4000 yards or the closest equivalent in meters depending on the range increment Remaining Velocity A small dot will appear to the left of the muzzle velocity value to indicate the bullet is in the transonic range A larger dot will appear to the left of the muzzle velocity value to indicate the bullet is in the subsonic range RANGE CARD A Rng RemV RemE 800 1272 629 900 91177 538 1000 1101 471 BALLISTICS SCREEN The Ballistics screen displays complete information about the ballistic solution that pertains to the currently selected target and gun The only parameter whose value can be altered in this screen is the Range this can be done by using Bf and gt to adjust the value Use SFW or EBD to scroll to a particular parameter Use to enter into a parameter screen for further information about it or change unit of measure Use to return to the Ballistics screen Note An R or an L will appear beside each solution to indicate which side of the target you should aim ATrag Signature Feature TRUE DROP In an ideal world shooters would go into the field knowing exactly how their chosen combination of gun and ammuni tion will perform calculated ballistic solutions would always be correct and a properly d
4. the alphabet and numbers 0 9 and several symbols Pressing q inserts a space between characters You can choose between upper and lowercase letters Once you re on the desired letter use o move the cursor to the next space in the gun name Continue until the gun name is complete When gun name is complete press button to save Gun will also automatically save upon exiting screen Press to will exit from the current screen Gun Library There is room in the Kestrel for up to 50 library guns Several library guns are pre programmed in each Kestrel but this can be modified by building a new gun library on a computer using the Horus Gun Library software and downloading the new gun library to the Kestrel either via Bluetooth connec tion or the Kestrel wired interface Downloading a new gun library will automatically overwrite the previous library guns in the Kestrel but not any user created guns GUN INFORMATION SCREEN Once you have selected your gun You re now ready to enter or modify all relevant parameters pertaining to the set up of your rifle These parameters include muzzle velocity ballistic coefficient bullet weight bullet diameter zero range bore height rifle twist rifle twist direction and sight adjustment click On the Gun Information screen press up or down to highlight the gun parameters Use g and gt to adjust the value Press oa to enter the highlighted parameter s scree
5. 500 mph 0 50 m s o 22 Target Speed Ts km h 0 20 fps o 73 knots o 43 Target Direction of Movement TD Left to Right OR Right to Left Name Characters NA D through 9 A Z a z amp and space fos 300 4500 Muzzle Velocity mv i n a Ballistic Coefficient BC no units 0100 2 000 a grains 10 1500 Bullet Weight Bw cane oo 3 inches 010 100 Bullet Diameter 8D a ao yards 25 1000 zene Renee or meters 23 914 7 inches 0 10 5 00 Bore Height BH a os oh A inches revolution 1 00 36 00 news iu cm revolution 2 54 391 44 Twist Direction RTA Left OR Right Sight Adjustment Click p 1 10 tmoa 1 10 Tatitude Tat degrees 305 SON Pandas Fen fahrenheit 50 140 i celsius 46 60 inHg 1200 32 00 p mb 406 4 10836 Station Pressure sp Se psi 5 89 15 72 Relative Humidity RH 1 100 ER T 10732 32767 Density Altitude computed Dalt E ne Aa Coriolis Coriol Yes OR No 27 Instruction Manual For Kestrel Pocket Weather Tracker with Horus ATRAG Ballistic Calculator Instruction Manual v 2047 Kestrel Pocket Weather Meters are designed and manufactured in the USA by NIELSEN KELLERMAN 21 Creek Circle Boothwyn PA 19061 Phone 610 447 1555 Fax 610 447 1577 Web www kestrelweather com Email kestrel nkhome com Please register your Kestrel Meter at www kestrelweather
6. Kestrel Pocket Weather Tracker with HORUS Atrag Ballistics Software Instruction Manual For Kestrel Pocket Weather Tracker with Horus ATRAG Ballistic Calculator a D d bh mt 8 ee E 3 W_0 39 78 Tgt 000 800yd Wind 30c5mph www kestrelweather com 800 784 4221 BASIC NAVIGATION The Kestrel has seven navigation keys Capture Up Arrow Backlight Pat P T Right Arrow Power On Down Arrow Center Key Escape Key QUICK TIPS Compass must be calibrated in order for directional features to work in Horus mode and it can only be calibrated in Weather mode Pressing will allow you to exit out of a particular screen When a ballistics parameter is underlined this means that the value is unable to be changed manually on the current screen either because it is a calculated value or one determined by the sensors Press and hold for 2 seconds will power down the Kestrel reguardless of current screen Press QJ twice in rapid succession to instantly change between Weather mode and Horus mode Any changes in information are automatically saved upon exiting the current screen There are 3 exceptions to this rule where an accept screen appears upon exiting the Target Range estimator the Target Speed estimator and the Drop Truing screen GETTING STARTED WITH KESTREL ATRAG BALLISTICS The three main data input groups are gun target and environment The aiming sol
7. ading adjusted for sea level When shooting station pressure is required Station pressure can be measured with the Kestrel by setting the reference altitude to zero on the Barometric Pressure screen in weather mode RANGE CARD SCREEN The Range Card screen shows detailed information about the ballistic solution at various ranges that apply to the currently selected target and gun The screen displays three columns comprised of the Range in the left column and two other variables The other variables that can be displayed are ballistics solutions based on Wnd1 Wnd2 Lead Elev or further information on bullet flight charac teristics such as remaining velocity RemV remaining energy RemE time of flight ToF and maximum ordinate or height above the line of sight to the target MaxO Please see Page 26 for a sample Range Card Use SFW or E to scroll to a particular range Use g and e scroll across and view all available parameters RANGE CARD A RANGE CARD A Rng Elev Wnd1 Rng Lead RemV 300 5 50 L013 300 0 00 1991 400 9 42 L0 19 400 0 00 1823 500 14 06 LO0 27 500 0 00 1666 Example of Rng clumn remaining fixed while 2 other columns can be changed Range Increment Use while in the Range Card to enter the Range Settings screen Use g and gt Ea adjust the range increment to the desired value You may adjust the increments to show
8. change to setting mode The direction will be continuously updated on the target line Pressing the P button again will capture the current direction as DoF The Tgt heading will return to its normal state Note If the compass is not calibrated anew screen will pop up to aleart you that capture won t work until compass is calibrated Wind Speed Quick Key Pressing the P button while Wind is highlighted will enter the Wind setting mode he Wind heading will change to WR indicate the setting mode The moving 5 second average for windage and wind speed will be continuously updated on the wind line The moving 5 second average for wind solution will be continuously updated Pressing the P button again will capture the current wind speed The Wind heading will return to its normal state The Wind line will show the captured relative wind direction and wind speed Note If the compass is not calibrated anew screen will pop up to alert you that capture mode won t work until compass is claibrated GLOSSARY OF TERMS Active gun When a gun is made active ballistic solutions for that gun pertaining to all active targets are readily displayed Ballistic solutions for guns that are inactive are not displayed Aiming Ballistic solution This consists of sight corrections for windage elevation and in the case of a moving target lead for a selected active gun and target along with other calculated val
9. elivered shot would always hit the target In the real world ballistic data is often imperfect and even well delivered shots often miss The best way to deal with this is to allow ballistic parameters to be adjusted to reflect what is actually observed When this is done correctly overall accuracy can be significantly enhanced The Horus Kestrel includes a Drop Truing screen to support this valuable function When all parameters are set press to escape On the Gun screen use Z to highlight the True drop item Press oa to enter the Drop truing screen In the Drop Truing Screen use 9p or QED to highlight the parameter you wish to change The parameters that can be adjusted are BC ballistic coefficient MV muzzle velocity or Range This adjustment is made so that the calculated elevation correction matches what is actually observed QUICK KEYS DIRECTION OF FIRE amp WIND SPEED The Direction of Fire DoF and Wind Speed WS1 amp WS2 Quick Key feature allows you to quickly and easily change the values of these parameters from the Main Horus screen without entering into the Target screen It minimizes the number of button presses and time by instantly capturing these values from one screen the Main Horus screen Direction of Fire Quick Key Pressing the Pp button while Tgt is highlighted will enter the DoF setting mode 19 to indicate the The Tgt heading will
10. ers are set press to escape An Accept screen will appear scroll to Yes if you would like to accept values Use to select the highlighted option Wind Direction amp Wind Speed There are two wind speed measurements on the target screen WS1 and WS2 for minimum and maximum wind speed as well as wind direction WD You have the option to manually adjust the wind speed and wind direction values or use the capture feature to automatically get a reading Manual mode Use W or E to highlight WD Ws1 or WS2 Use g and gt to adjust values for each parameter Capture mode In the Target screen press oS to enter into either the WD WS1 or WS2 screen Press to enter into the capture mode Face the back of the Kestrel directly into the wind and press C Jie start and stop the capture mode 13 The data collected in capture mode will automatically adjust the WD WS1 and WS2 values in the Target screen Note WS1 can never be greater than WS2 value The WS2 value will automatically adjust to ensure that this remains true Direction of Fire Direction of Fire DoF is an absolute frame of reference to true north The value is the direction the gun barrel is pointng with respect to the values on a compass Direction of Fire can be manually adjusted or obtained using the capture feature Manual mode Use WW or E to ensure that DoF is highlighted
11. he highlighted option Target Direction Use AEZ to highlight TD Use BT and 9 to adjust L R left to right or R L right to left 15 For information on True Drop please see page 19 ENVIRONMENT SCREEN The Environment screen contains all atmospheric parameters such as temperature station pressure and relative humidity Setting the Auto parameter to Yes automatically imports the Kestrel s sensor data into the Environment screen The Auto parameter can also be set to Manual when it is highlighted by using or Bite in the Manual setting the temperature Temp station pressure SP and relative humidity RH can be manually adjusted ENVIRONMENT Auto No Lat 42 N Temp 75 F SP 29 48inHg Use WW or to highlight a parameter Use g and gt to adjust the values for each parameter Coriolis will default to Yes unless you manually change it to No While it s on the Yes setting this means that coriolis is taken into account for the ballistics solutions Density altitude will automatically adjust according to the adjustment of the relevant environmental parameters This parameter cannot be manually changed because it is a calculated value Note station pressure SP is pressure reading is unadjusted for sea level Sometimes this is mistakenly called barometric pressure in ballistics software Barometric pressure is a pressure re
12. hich test firing is being done Drop the elevation correction calculated for the specified range BC the ballistic coefficient used in the current elevation calculation MV the muzzle velocity used in the current elevation calculation Sight Adjustments TMOA true minute of angle MIL USMC mils 25 Sample of full Range Card data relative to data seen on display RANGE CARD Al Rng Elev Wnd1 100 0 06 0 10 200 2 28 0 22 300 5 56 0 34 400 9 49 0 47 500 14 12 0 61 600 19 33 0 75 700 25 34 0 90 800 32 25 1 06 900 40 21 1 22 1000 49 24 1 36 1100 59 34 1 49 1200 70 40 1 63 1300 82 46 1 75 1400 95 35 1 82 1500 109 1 1 91 1600 123 7 2 00 1700 139 2 1 99 1800 155 5 2 04 1900 172 7 2 08 2000 190 9 21 2100 210 0 1 96 2200 230 0 1 95 2300 250 7 1 94 2400 272 7 1 92 2500 295 9 1 89 2600 320 2 1 44 2700 345 6 1 35 2800 372 2 1 25 2900 399 7 1 14 3000 428 8 1 02 3100 459 5 0 88 3200 491 6 10 23 3300 525 2 10 46 3400 560 1 10 71 3500 596 6 10 98 3600 635 0 11 28 3700 675 8 11 59 Wnd2 0 21 0 47 0 72 0 99 1 31 1 62 1 96 2 31 2 67 3 03 3 37 3 71 4 04 4 29 4 57 4 84 5 00 5 22 5 42 5 62 5 63 5 78 5 93 6 06 6 19 5 90 5 97 6 03 6 08 6 11 6 14 5 18 5 11 5 02 4 92 4 80 4 66 Lead 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00 0 00
13. in Horus screen press to access the Main Setup Menu Press QEZ to highlight Gun Selection Off Weather Mode Horus Mode select Qexit 7 Press oa to enter Gun Selection Screen Here you may choose a preconfigured gun or build your own To Choose a Preconfigured Gun Press Sp or EW to scroll through the different guns Press 9 to turn your selected gun on or off On means the gun is available to be selected in Horus mode Off means the gun is not available to be selected For example setting multiple guns to On allows you to quickly switch gun configurations without going back to the Main Setup Menu Gun select gt User Gun2 gt User Gun 300WinMag2 When the desired gun is highlighted press oa to enter the Gun Information screen To Build A Gun You can build and name your gun on the gun selection screen Use BD to highlight New Gun and press oS Gun select gt MaruGun308 gt AR15a gt 300WinMag1 gt New Gun This will take you to the gun information screen where you may adjust all gun parameters Press up or down to highlight the gun parameters Use SF and to adjust each value To name your gun scroll up to highlight Gun and press New Gun 2900fps 0 533 190gr 0 308in You will see a cursor appear under the first letter of New Gun Use the p and AZ buttons to scroll through
14. l current wind speed WS2 maximum current wind speed Gun Screen MV muzzle velocity BC bullet ballistic coefficient BW bullet weight BD bullet diameter ZR zero range BH bore height RT rifling twist rate distance in which bullet achieves 360 degrees of rotation RTd rifling twist direction right clockwise from the shooter s perspective Click assigns an angular value to sight clicks Environment Screen Auto controls whether values for temperature barometric pressure and relative humidity are obtained automatically from the Kestrel s weather meter functions or are manually set by the user Lat allows the user to specify the latitude north or south of the equator that will be used when calculating Coriolis corrections Temp temperature SP station pressure actual pressure at the gun s location RH relative humidity Dalt density altitude calculated from pressure temperature amp humidity Coriol controls whether Coriolis corrections are included in ballistic calculations Wind controls whether wind direction is controlled manually or automatically Range Card Screen Elev the elevation sight correction Wndg the windage sight correction based on WS1 see Target screen above Wdg2 the windage sight correction based on WS2 see Target screen above Lead the lead sight correction for a moving target RemV the downrange bullet velocity RemE the do
15. n Here you are also able to adjust the parameter s value as well as the unit of measure For example meters per second to feet per second On the Gun Information screen you also have the option to delete the gun by highlighting Delete this Gun and pressing the s button Press to exit to Main Horus screen once all values are correct See below for more information on Muzzle Velocity and Ballistic Coefficient Muzzle Velocity Use WW and to highlight Mv Press to enter MV screen Use g and 9 to adjust the value Notes on Muzzle Velocity When a bullet is in the transonic range a small dot will appear to the left of the muzzle velocity value figure 1 When a bullet is in the subsonic range a larger dot will appear to the left of the muzzle velocity value figure 2 GUN gt Laru308 GUN gt Laru308 mv 1360fps MV 1103fps BC 0 470 BC 0 470 BW 1759r BW 1759r BD 0 308in BD 0 308in Figure 1 Figure 2 In cases where the bullet is supersonic there are no dots next to the muzzle velocity value MV Temp Table This allows you to enter and maintain a table of muzzle velocities based on temperature If an entry is input into the table the muzzle velocity is applied at all temperatures this means that the value is then locked and cannot be altered by using and on the gun information screen If two or more entries are input into the table the Kestrel uses the linear inte
16. repeating the steps outlined above Active The Active status of Target A defaults to Yes because the Kestrel must have at least one active target at all times To make a target active on the Target screen use E or ED 10 highlight Active and use to change to Yes To make a target inactive use or o change to No Setting a target s Active status to Yes allows you to view the firing solution for that target on the Main Horus screen If multiple targets are active you can use or to scroll between all active targets and their respective firing solutions on the Main Horus screen 11 Elevation E 49 24 W 1 36 3 03 Tat 000 100m Wind 30c 5mph 16 58 B 0 68 1 46 R Tot 000 549m Wind 30c 5mph Windage Lead or hold Target A is the current active target Target B is the current active target Target Range Use WW or GED to highlight TR Use g and e adjust the value Target Range Estimator This function estimates the range of a target based on size image and calculated range When TR is highlighted press Sa button to enter Range screen Range 998m meters Estimate Use to highlight Estimate and press GS to enter Range Estimate screen Use WFW or E D to highlight a parameter Use g and e adjust values for each parameter When all paramet
17. rpolation and the temperature sensor to determine the appropri ate muzzle velocity Note this value will only change if the temperature changes and you exit and re enter the gun information screen once a muzzle velocity value is entered for a particular temperature you can not make another muzzle velocity value for the same temperature To access MV Temp table scroll to MV Muzzle Velocity to highlight it and press oS then use 10 scroll to MV Temp and press So enter Muzzle velocity MV 2900fps feet per sec MV Temp Press while New entry is highlighted to enter the Table Item screen Use Sp or QE to scroll to Temp and MV Use g and e adjust each value Table item 10 F MV 2900fps Clear To clear a Table Item scroll down to Clear and press Press to exit to return to the Gun Information screen BC Dist Table This allows you to enter and maintain a table of ballistic coefficients based on distance If only one entry is input into the table the ballistic coefficient is applied at all distances this means that the value is locked and cannot be altered by using and pe the gun screen If two or more entries are input into the table the Kestrel uses the linear interpolation and the target range to determine the appropriate ballistic coefficient Notes this value will only change if the target range changes once a ballistic coef ficient value is entered for a partic
18. ues such as bullet velocity and energy On the main Horus screen only elevation and windage are displayed On the Range Card and Ballistic Info screens detailed ballistic solution data is available Subsonic The speed at which the bullet is slower than the speed of sound Bullet velocities in this range will be displayed with a large dot to the left of the value Target A target is characterized by its direction range inclination angle and applicable wind a moving target has a direction and speed of motion Targets are identified by a single letter up to five can be described designated by the letters A through E It s important to note that wind is specific to a target each active target has its own wind specification Transonic The speed at which the bullet slows to the speed of sound This is also seen as the boundary between supersonic and subsonic Bullet velocities in this range will be displayed with a small dot to the left of the value 21 BALLISTIC amp ENVIRONMENTAL QUICK REFERENCE Target Screen Active tells whether this target is currently active TR target range DoF direction of fire relative to true north Ideg inclination angle negative means the target is below the shooter Icos inclination cosine cosine of the inclination angle TS target speed TD target direction of movement WD current wind direction direction from which wind is blowing relative to DoF WS1 typica
19. ular distance you cannot make another ballistic coefficient value for the same distance To access the BC Dist table scroll to BC Ballistic Coefficient to highlight it and press then use 10 scroll to BC Dist and press ESF to enter Ballistic coeff BC 0 533 Use Sp and to scroll to any existing parameters Use g and e adjust each value To add a new entry highlight New Entry and press Use SFP and 4E to scroll to Dist and BC Use g and e adjust each value To clear a Table Item scroll down to Clear and press Press to exit to return to the Gun Information screen Table item om BC 0 Clear TARGET SCREEN You can customize up to five targets for location distance direction declination and wind From the Main Horus screen use S or QED to highlight Tgt and press Sa to enter the Target screen TARGET Active DoF Ideg Use up and down to highlight a parameter Use g and j gt to adjust values for each parameter Press oS to enter the highlighted parameter s screen Here you are able to adjust the parameter values as well as the unit of measure For example yards to meters Multiple Targets You may create up to 5 targets A E by using P until Target is highlighted and then pressing or to move on to the next target After changing targets the parameters can be changed by
20. utions for Elevation Windage and Coriolis are displayed on the Main Horus screen 1 Gun Information 2 Target GUN gt Laru308 TARGET A MV 2550fps Active Yes BC 0 470 TR 1000 BW 175gr DoF 000 BD 0 308in Ideg 0 ZR 100m Icos 1 000 BH 2 50in TS Omph RT 11 00in TD LR RTd Right wD 120c Click 1 mil ws1 5mph True Drop ws2 10mph Delete this gun A box indicates anfount of data shown on display Data below box indicates additional information available by pressing Qe 3 Environment ENVIRONMENT Auto No Lat 42 F Temp 75 F SP 29 48inHg RH 50 Dalt 1729ft Coriol Yes Wair Onetgt These three main data groups determine an accurate firing solution The first step in getting a firing solution is selecting your gun GUN SELECTION The Gun Selection screen allows you to choose a preconfig ured gun or build your own You may create and store up to 9 user created guns A user created gun is defined as a gun that has been modified for one or more parameter values of the New Gun or any of the library guns When a New Gun is modified the name instantly changes to UserGunX where X is a number suffix to ensure the name is unique If a library gun whose name ends in a letter is modified a number will appear at the end to create a unique name Ifa library gun whose name ends in a number is modified a letter will appear at the end to create a unique name Turn on the unit From the Ma
21. wnrange bullet energy ToF the bullet s time of flight MaxO the bullet s maximum ordinate height above the line of sight to the target Ballistics Data Screen Range the range for which the ballistic solution is calculated Elev elevation correction Wndg windage correction based on WS1 Wdg2 windage correction based on WS2 Lead lead correction based on specified target motion vCori vertical Coriolis correction hCori horizontal Coriolis correction Drift bullet drift correction 23 RemV remaining velocity RemE remaining energy ToF time of flight MaxO maximum ordinate highest point the bullet reaches in flight Drop total drop distance Rtrns range at which transonic velocity transition begins Rt 75 distance at which a bullet is 75 through the transonic range Rsubs range at which bullet velocity becomes subsonic Range Estimation Screen Target the size of the target on which estimation is based Image the apparent size of the target as it appears in a telescopic sight Range the calculated range based on the target and image sizes Speed Estimation Screen Range the range at which the speed estimation will be done Mvmt the apparent movement of the target as it appears in a telescopic sight Time the time in seconds during which movement was measured Speed the calculated speed based on range movement and time True Drop Screen Range the range at w
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