Rally Odometer

This is a simple GPS odometer that is adjustable for Rally use.
The GPS signal is filtered using a proprietary algorithm to reduce location drift.
​The odometer is accurate to within 0.5%, similar to a wheel-driven odometer.
The odometer is adjustable in increments of 0.01, 0.1 and 1.0 distance units (miles or km)
The odometer can be run backwards or forwards.
The odometer can also be stopped and re-started at any time without zeroing.
Distance units of miles or km can be selected.
A correction factor can be set to speed up or slow down the odometer to match the route book, this is typically done during on ODO Check at the beginning of the rally.

Auto-Factor feature:
​The correction factor can be set automatically during the odometer check using the Auto-factor button.

1. Zero the odometer at the start of the odometer check, at zero route book mileage.
2. Drive the odometer check to the end. You can use the increment/decrement buttons during the odometer check as these adjustments are accounted in the Auto-Factor calculation.
3. At the end of the odometer check, hit the Auto-Factor button. You will be prompted for the ideal distance from the route book. The app will then compare this to the raw unadjusted odometer and calculate the correct factor.
4. The Auto-factor process can be repeated whenever distance is accumulated after a fresh odometer zero. It will adjust an existing factor that has been set manually to something not equal to 1.0000 .

Considerations:
In device settings>Location, turn off network location and turn on GPS. Only GPS location can be used with this app.
It is strongly recommended that you also disable cell phone and texting. The App will continue to operate correctly, but the distraction is unwelcome.

Also check out the Rally Calculator from Right Turn Software on the Google Play Store... a full featured and intuitive time-keeping solution for Rally Navigators, available in Full and Free trial versions!