There are two similar apps from this developer
- 'Enduro CheckPoint' requires external odometer
- 'Enduro CheckPoint Two' uses GPS or Bluetooth (odometer not required)

Enduro CheckPoint Two Features-
Constant display of -
- Mileage
- On-Time, Early, Late indication is seconds
- Next Possible Check Mileage
- Current route sheet average speed
- Next Reset or Free Time
- Seconds on check point clock
- (new) Actual speed
Visual warning when within 20 seconds of upcoming check
'GO' indicator whenever safe to move forward
Automatic mileage advance at resets
Reset Countdown timer
Free Time Countdown timer
Selectable GPS or Bluetooth mileage input
Selectable audio (beep) indication of on-time and early
Swipe left or right to adjust mileage in one tenth mile increments
Three mile clear ahead rider input after check point

Setup -
The app opens to the setup screen
Rider inputs race data -
- Race Start time of day
- Key time, taken from system clock, can be adjusted to match clock at sign up
- Row Number
- If Bluetooth is used, rider also inputs wheel circumference
- Rider selects Bluetooth if desired
- Rider selects audio cues if desired

Speed Changes, Resets, Free Times
Separate input pages are used to input all timekeeping feature of the race from the club's route sheet.
Rider inputs every speed change, reset and free time.

(new) Reset to Zero:
In resets, enter the reset (example) from 32 to 0
In 'speeds' and 'freetime' enter ' 000 0' one one line to separate entries associated with different loops

Operation
Once all data has been input, Rider clicks on 'GO' tab
Prior to start time, the app will countdown to start time.
When start time arrives, app begins timekeeping automatically.
While on time (within rider minute) display will indicate 'on-time', and display a numeric value
1 - 59 of seconds into riders minute
While on time rider will hear (optionally) a single beep every three seconds.
When Early (more than 59 seconds ahead of ideal time) display will indicate 'early', and display a numeric value
in minutes:seconds of time early
When early rider will hear (optionally) a double beep every three seconds.
When Late (more than 60 seconds behind ideal time, display will indicate 'late', and display a numeric value
in minutes:seconds of time late. When late, there is no audio cue.
When On-Time, this portion of the display is green text
When Early, this portion of the display is lght blue text
When On-Time, this portion of the display is yellow text

Whenever it is safe to proceed (not early, not in reset,free time, or approaching possible) 'GO' is displayed in green in upper left
As a check is approached, a yellow warning appears in upper left ex: 'Check 12.4'
As a check is approached the 'Check Time Seconds' display changes to yellow, as it counts up to the '0' check entry time.
When check entry time arrives, yellow 'Check 12.4' changes to green 'GO', and a burst of beeps indicates safe to enter.
When Late, the check advisory does not appear, and 'GO' remains in display.

When riding on time and a reset or free time mileage is reached, The upper left display will show time remaining at that way-point.
Free time and reset countdowns are not displayed when late or early.

Mileage can be corrected in 0.1 mile increments with a single swipe of the screen.
Each swipe to the right adds .01, each swipe to the left subtracts 0.1.

At a check point or gas stop, the next three miles can be cleared of possibles display with a triple tap on the screen.
If done in error, use a second triple tap.

more info http://www.fpcbaseball.com/checkpointtwo