ArrivalTime was a PalmOS app. It was for use in stage rally competition and was the original approach used in our apps to calculate control arrival time. Afterward, the approach was changed to that used in the PalmOS app TimeCalc and the iOS app ATC Calculator.
The ArrivalTime icon is in the center of the top row 
The initial screen when ArrivalTime starts 
Menu item for Calculate From menubar item 
Dialog for adding control 
Dialog for entering initial arrival time if first control is a ATC 
Dialog for entering the out time if the first control is a MTC 
Dialog to confirm clearing event times 
Dialog to confirm removing all events 
Before tapping Start 
Prompt for initial MTC Out time 
Calculated arrival time for ATC1 
Prompt for stage start time 
Calculated arrival time for MTC2 (running of other stages not shown) 
Dialog box indicating the end of the event 
Calculated arrival time as above 
Prompt for stage finish time 
Calculated arrival time for ATC2