A simple test....
Set up a solution on the TDC. For example set the speed to 8 knots and the AoB to 90 and bearing to zero. First, set the range at 500 and check the gyro.
Next, set the range to 2500 and check the gyro. Has the gyro changed? If so, the range is important for the shot, and the difference in the two gyro angles is the amount of error you would have in your solution with a 2000 meter error in your range estimation.
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