NOTE: ATC Calculator does not currently run on iOS 9. A new version that will correct this problem is under development.
ATC Calculator is an iPhone app for use in stage rally competition for calculating the arrival time for the next control. Time can be entered in minutes or hour:minute format. Hour:minute time is based on a 24-hour clock.
The time values are displayed in a large format for easier viewing. The buttons are larger and separated to make it easier to select the intended button on rough transits.
ATC Calculator is available through iTunes.
Screen shots of ATC Calculator are available.
Support information is also available.
And, of course, a list of Frequently Asked Questions is also available.