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Calibrating the distance measurement

Manual Calibration​

In the menu navigate to :

OPTIONS > SETTINGS > SENSORS > DISTANCE

and adjust the factor by small changes using the + and - menu entries. After each change take a length measurement of a line with a known length and compare the result. If the measurement is too short increase the factor otherwise decrease it.

This is not the recommended way to calibrate the length. The Auto mode described below is recommended.

Automatic Calibration​

  • Put in place a line with markers separated by 5m precisely if the unit is set to METER, or 15 ft if set to IMPERIAL.
  • Select OPTIONS > SETTINGS > SENSORS > DISTANCE > AUTO
  • Take a measure between those two markers as if they were two stations(tie-offs) in a cave.

    The Standard survey process is explained here

  • Once done you’ll get a message Adjustment : X , X being the adjustment factor ( How much the factor needs to be changed to have a good measure).
  • Repeat that operation until you get an adjustment factor of 0 or 1.

Tip: If at any point during a survey dive you realize that the line measurement is not working anymore, change the parameter WM to the value 1 or 2 instead of 0. Try both setting to find the one that is still working.