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Tools & Setup
Figure 4-20: Odometer Calibration – select a distance and then press Start
Upon completion, it displays the screen in Figure 4-21 (left image). You can either accept the
new value by pressing Accept or revert back to the previous value by pressing Reject. If the
new value is significantly out of range, the test will fail Figure 4-21 (right image).
The odometer calibration value is stored in the Display Unit. If the Display Unit is changed, or
swapped out, you will need to run the Odometer Calibration test again.
Figure 4-21: Results of Odometer Calibration (L). Image on right shows a failure, as calibration is way out of range
4.2.7 GPS
The DVL contains an internal GPS, but you also have the option to purchase an external GPS
receiver from Sensors & Software. Alternatively, you may have your own GPS that you want to
connect to the system. The GPS test will ensure that the system is communicating properly
with the GPS and receiving data (Figure 4-22). It doesn't mean you are actually seeing
satellites; the GPS test can still pass indoors with zero satellites visible. If the test fails, check
the GPS cable is connected securely at both ends and the GPS is receiving power.
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