iPhone Screenshots


ATC Calc Plus is for use in stage rally competition to calculate the arrival time for the next control. This enhanced version includes a countdown timer and the ability to adjust time (within ATC Calc Plus) to match rally time.

ATC Calc Plus displays the time in large digits that are easy to read, even in bright sunlight when the rest of the display is hard to read. The buttons for entering the time and adding transit times, bogey times, etc. are large to make it easier to enter them on rough transits. Once the arrival time has been calculated, it takes two presses of the Clear button in order to reduce the chance of accidentally deleting the calculated arrival time because of a finger slip on a rough transit.

All of these features have been tested on stage in real rally conditions.

What’s New

Version 2.1

This minor update to ATC Calc Plus resolves minor issues and includes one improvement.

The improvement is that the check-in time countdown changes colors one minute before the target time (dark green) and changes colors again during the check-in minute (dark orange).

Ratings and Reviews

2.5 out of 5
2 Ratings

2 Ratings

Mobedda1 ,

Great product until!

Worked great and used it everyday until IOS9! How did the creators not see this coming! Please fix it ASAP!

Daim2 ,

Does not work in iOS 9

Needs to be updated


Alan Perry
1.7 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2019 Snowmoose Software/Alan Perry


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