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Delta VĀ© Software

This program can be purchased only on an SD or micro-SD card; it will run ONLY on PDAs that come equipped with an SD port.  It will not function in an adapter used for other ports.  The operating system on the PDA must be, at a minimum, WM 5.0 or above.  An evaluation version is not available, but you may download the manual to review the software's features and tools.

Important Notice for International Buyers: Due to excessive credit card fees charged for international transactions, payment must be made via bank wire transfer.  Please contact sales@lextalus.com with a list of items to be purchased and a quote will be sent along with wire transfer details.  We sincerely regret this inconvenience.

Delta V Manual, 2nd Ed. - Download


 Delta V $395.00

  Purchase Standard


Optional Card Size upgrade:

8 GB   -  Add $5        Purchase
16 GB -  Add $15      Purchase
32 GB -  Add $30      Purchase


Deprecated Card Sizes:

2 GB   -  Add $12      Purchase

Please note that the 2GB card size is at the end of its life and good quality 2GB cards are becoming hard to find.

The  32 Gigabyte cards are "special order" and may delay shipment of card

Card Size Note:  SD cards that are 4 GB and larger are "SDHC" (Secure Digital High Capacity) and may not be readable in older drives.  However, newer drives that can read SDHC cards are backward compatible and can read standard capacity 2 GB cards.  Check with the manufacturer of your device before ordering.  Because of the potential for incompatibility, the 2 GB card continues to be offered but may be difficult to obtain.




Delta III (old downloaded type, must have license key) to Delta V  $325  (New SD Card)   Purchase

Delta III (on SD Card) to Delta V  $250  (Upgrades existing SD Card; Instructions.)   Purchase

Delta IV to Delta V  $125  (Upgrades existing SD Card; Instructions.)   Purchase  



Delta V ver. 4.7 and earlier to current Delta V  ver. 4.8  $45  (Updates existing SD Card; instructions.)  Purchase 

Delta V ver. 4.8 update to current version instructions  here.  Warning: Do not use this download unless your program version is 4.8.  The program will not work in cards with earlier versions.  Version 4.8 change list here.



No charge for defective card replacement

Restore functionality due to user induced errors or transfer to different SD card $45    Purchase 





KestrelĀ® Bluetooth Interface
The Kestrel model 4000, 4200, 4300 and 4500 comes with Bluetooth communication capability that can deliver the pressure, temperature, humidity, wind speed, and, in the 4500 only, wind direction.  The program will allow the user to update these variables by either pressing the Enter button on the face of the PDA or set the program to continuously update these values at intervals from 2 to 60 seconds.

The POI Method of Obtaining Muzzle Velocity
As the manual points out, chronographs are not self-calibrating; it is not known whether the velocities they output are correct or not. While chronograph data errors, even if erroneous by 10% or even 15%, will not show up when shooting under 500 meters, at longer ranges the errors in muzzle velocity, even small errors, will produce inaccurate trajectory data.

Feedback from military personnel operating in Iraq indicated that a non-chronograph method of obtaining or verifying muzzle velocity was needed in order to test new lots of long range ammunition as well as scavenged ammunition. The POI method was derived wherein the user shoots at a target somewhere between 300 to 600 meters and notes whether the group is impacting above or below the point of aim. The program subtracts the scope error (the difference between the total value of the clicks and the computed elevation - the dialed elevation and the computed elevation will almost never be the same) and then computes what muzzle velocity is required to print the group where it actually is on the target.

It turns out that this method is an excellent way to check the accuracy of the chronograph because it is highly accurate and clearly can be a better data point than that obtained from the chronograph. Even if the chronograph is used initially to obtain a muzzle velocity, the POI method should be used to verify the data. Once a valid muzzle velocity has been obtained, it can be used to calibrate the chronograph by suggesting an error rate or percentage that can be used to correct chronograph output. And this allows the user to compute a better ballistic coefficient for use in the program.

Obtaining a Better Ballistic Coefficient
Method 1: To compute a ballistic coefficient using this method, two velocities are needed: a muzzle velocity and a downrange velocity. The further downrange the better, but realistically since a chronograph will be used to obtain this velocity, the range has to be close enough so our chronograph is not hit by an errant bullet. Max range will therefore probably be between 300 and 500 meters. First the chronograph is used to obtain a muzzle velocity, then the chronograph is placed downrange to obtain a second muzzle velocity. The ballistic coefficient workspace is then used to compute a trial ballistic coefficient. If the muzzle velocities are erroneous, this calculated trial BC will also be erroneous. Example: If the velocities were high by 10%, the calculated BC will be larger by about 5%. A way to correct for the chronograph velocities is obviously needed.

By using the POI method of computing a muzzle velocity, two important data points are obtained: an accurate muzzle velocity and a means to compute the error of the chronograph by simply dividing the chronograph value by the POI method value. This error rate can then be used to correct the downrange chronograph velocity. Of course, this supposes that the chronograph has a consistent error rate. This cannot be determined for certain, but this is probably a decent assumption and better than taking the downrange result at face value.

Using the corrected velocities, a good ballistic coefficient can then be computed for that bullet and it will probably be different from the value given by the manufacturer. Using this newly derived ballistic coefficient and using the POI Method workspace, the muzzle velocity is then re-computed. If the muzzle velocity is altered appreciable, go back to the BC computation workspace, calculate a new error factor, derive a new downrange velocity and re-compute a new BC. This iteration process is repeated until both the computed muzzle velocity and BC don't change materially. At that point very accurate values for both muzzle velocity and ballistic coefficient have been computed and may be used with a high degree of confidence to produce excellent theoretical trajectories.  However, as a practical matter the ranges used for this method tend to be short unless the user has access to sophisticated data gathering tools; better results can be obtained by lengthening the range.  Doppler radar data would be perfect.

Method 2: This method uses the POI of the bullet at range, generally where the bullet has slowed to around 1400 to 1500 fps (425 to 460 m/s) and calculating the ballistic coefficient of the bullet based upon what would be required to correct the point of aim to point of impact.  This method assumes that the shooter has done the work in scope calibration and has obtained a good and accurate muzzle velocity.  And, because this work is at range, it assumes that other atmospheric variables have not affected the bullet strike - such as up or down movements of the air.

Other Notable Features
This program has many features available for the shooter operating on his own or as part of a larger team. Some of the more important features include:

  1. The program and all related data files are on an SD card; the program starts upon card insertion and stops upon withdrawal. No data is left on the PDA. This is a much more secure arrangement and insures that data will not be lost if the PDA is damaged. No license keys are required. The program is not installed on the PDA so it can be used on any PDA that has an SD slot (or mini-slot.) (This means that TDS Recon units will not run this software; the TDS Nomad will.)
  2. A log button which logs shots taken to include date, time, location, MET variables, shooter, bearing, range, elevation and windage. This log is editable and may be saved on a per mission basis for later use and/or documentation.
  3. Additional computation tools to 1) compute/verify muzzle velocity through a point-of-impact method at range when a chronograph is not available; 2) compute bullet ballistic coefficient for use with the program. Although the G1 ballistic coefficient published by most bullet manufacturers is generally very close and can be used by the program with good confidence, at longer ranges a more precise number is required and this tool allows the user to obtain a ballistic coefficient that is better than the manufacturers G1 ballistic coefficient, at least for use in this program.
  4. Rifle profiles that can have multiple cartridges associated with the designated rifle together with elevation and windage offsets for each cartridge. This cartridge list is available with a single button click from the main page so that switching cartridges does not require loading a new rifle profile. Further, because each cartridge has associated elevation and windage offsets, selecting a new cartridge that otherwise has a different POI than the default cartridge, the offsets allow seamless use of the selected cartridge without having to change or adjust for the different POI.
  5. Offset profiles that can be used when one shooter is replaced by another on the first shooter's rifle. The second shooter may need to correct the impact point due to the way he manages the rifle and scope and the offset profile permits him to load the necessary elevation and windage offsets so that he does not need to re-zero the scope or to mentally adjust firing solutions by the offsets.
  6. Serial port interfaces for commercial laser range finders that output range, bearing and angle. Each time the range finder is used to range a target, the data is brought into the program at various locations to: 1) automatically compute a firing solution; 2) compute the target's coordinates so as to quickly create target files; 3) or to create direct ranging files.
  7. An advanced set of conversion factors and equations useful for long range applications.
  8. One click access to rifle profile lists, offset lists and target lists with the ability to quickly edit or create files on these lists.
  9. Size-of-Objects database accessible from the reticle ranging form with the ability to quickly import the size of a selected object, using either English or metric units, into the form to complete the ranging of the object.
  10. A "Capture" function on the Elevation Table to export the data to a CSV file which may be opened in a spreadsheet program to create and customize ballistic field cards.
  11. A manual timing form to enable the user to measure target speed by using an MOA or Mil dot reticle.
  12. A Target Ranging Card - combines the GPS and serial output of a range finder to create a list of targets from an FFP as quickly as the shooter can range.  The targets are listed with both vertical and windage hold-offs such that target acquisition may be had without dialing a firing solution.  Targets may also be added manually.  The target list may be saved as a group target file for loading at some later time.  Group files may also be created from the Target List.
  13. A specialized work space for working out problems of shooting through an opening or loophole at a target.  Specifically, the workspace helps the shooter determine the distance at which but bullet makes the initial intersection with the line of sight (LOS).  This tells the shooter the distance he must be to be able to shoot through the smallest opening possible. Second, the software will tell the shooter where the bullet is with respect to the LOS from the muzzle out to any practical range.  This particular information is valuable to solve a number of shooting scenarios, not the least of which is shooting through a chain-linked fence which is situated between shooter and target.  Given a target range and the distance to the fence, the program will indicate the bullet path at the fence allowing the shooter to organize the shot such that the bullet transits the fence through one of the chain-linked openings.  A similar approach would apply to shooting under a bridge or high tension wires.  Or, at close range, whether a bullet will clear a wall, car door or other obstacle just feet from the shooter.
  14. When shooting through openings, it is important to know from the shooters point of view, the upper and lower limitations to avoid having the bullet hit the edges of the opening, whatever it consists of.  The program will compute "Reticle Brackets" which tell the shooter the upper and lower bounds of the area in the scope to be kept clear to insure an unobstructed path through the opening.  In addition, depending upon the size of the opening and the distance the shooter is from the opening, the program can compute the maximum range in which a target may be acquired with the bullet guaranteed to successfully negotiate the opening.  The program will tell the shooter whether this maximum range exceeds the supersonic range of the cartridge being used or, alternatively, whether the accessible range is beyond the maximum useful range of the cartridge (defined as 1/3 the maximum possible range of that particular cartridge.)

These tools will permit a shooter to setup a shooting position to maximize the range he can effectively cover with the sure knowledge that he will be able to safely and effectively take any shot within that range and that the bullet will successfully transit the opening on its way to the target.

The Delta V can be delivered in the standard size SD card with 2 Gigabytes of memory or as a micro-SD card with the same amount of memory and housed in an integral adapter for use in regular sized SD card slots.