the author of this app says:
Parker RedHot Arrow Drop Compensator
RedHotADC, from Parker Bows, is the only ballistics software available specifically designed and developed for users of Parker Crossbows and Parker RedHot, RedHot IR, Hawke SR or Hawke MAP telescopic sights.
Easy to use in the field
1) Choose your reticle and launch speed,
2) Find the angle from your tree-stand/platform to target,
3) Enter the crosswind (if any),
4) RedHotADC shows your aim-point!
At a glance :
* Easy data entry and setup,
* Simple, accurate and fast inclination angle estimation (iPhone 3GS+, iOS 4.0+),
* Parker RedHot, RedHot IR, Hawke SR or Hawke MAP reticles,
* Accurate Wind Deflection calculation and display,
* Tried, tested and approved
- Requires iOS 4.2 or later.