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A GPS based rally odometer with Halda Twinmaster-like functions.
Upper counter is for main mileage.
Lower counter is for auxiliary and interval mileage.

Start button starts GPS monitoring. When started the text is green.
Stop button stops GPS monitoring.

Upper Counter mileage can be changed by 1, .1 and .01 buttons.
Z-Aux sets the trip meter to zero.
Split OM displays mileage when button was pressed and also resets trip.

Factor field when pressed brings up a numeric entry field to edit the factor.
Set Factor sets the factor to the value in the factor field and closes numeric entry.
Chevrons set direction of mileage
GPS Accuracy displays a count of how many GPS readings since last zero or start. Also displays the horizontal accuracy of the new and old GPS readings.

The reverse buttons and stop buttons are activated by swiping rather than pushing in order to prevent inadvertent actions.

Mileage is updated about once a second.

Two interval timers.
Functions can be set in settings
Each timer/clock can be set to run in seconds or cents.
Z-Aux zeros lower counter
GPS/0 starts GPS and zeros both counters.

Each timer/clock can be set to read in seconds or cents.

Timer functions
Timers are self resetting interval timers.
Clear set;s them both to 0.00 and stops them.
T1 wait delays the start of timer 1 until the top of the minute.
Stop and start stops current timer and starts other timer at 0.00
Pause and start stops timer 1 and stars timer2. Pressing pause again starts timer 1 where it left off.Useful for pauses.

Continued use of GPS running in the background can dramatically decrease battery life. If you plan to use for extended periods of time run with the charger connected.