DSM250 User’s Manual
be altered. The speed calibration process provides a method for the actual STW reading produced by the DST100 to be adjusted within the DSM250 (i.e., calibration data is not stored within the DST100).
WARNING: Unlike resetting the trip log and setting the depth offset, which actually programs the DST100 so that all displays receive the same information, speed calibration must be performed at individual displays in order to show calibrated speed through water.
6.9.4 Transducer Depth Offset
The DSM250 can set the transducer depth offset parameter in a DST100 depth/speed/temperature transducer. If you are interested in the actual water depth (as opposed to the depth beneath the keel), then you should program a positive value equal to the distance from the waterline to the depth of the DST100. The DSM250 will then add the measured depth of the water (as seen by the DST100) to the programmed offset value to produce the total water depth. If you are interested in the depth of water beneath the keel, then you should program a negative value equal to the distance between the DST100 and the bottom of the keel. The DSM will then subtract the programmed offset from the measured depth of the water (as seen by the DST100) showing you the depth of water beneath the keel.
You program the transducer depth offset by pressing the Enter key ( 
) with the “Transducer Depth Offset:” menu item selected which results in the screen shown in Figure 78.
Figure 78 – Setting the Transducer Depth Offset in a DST100
With the offset value highlighted, you can change the offset by using the Increase and Decrease
keys ( 
or 
). Once you have selected the desired offset, push the Enter key ( 
) to complete the transducer depth offset calibration. This procedure actually programs the offset value into the DST100 such that all displays subsequently receive the offset information. This means you don’t have to program multiple displays each with the corresponding offset information as the information is stored at a single place (at the source).
6.9.5 Trip Log
The DSM250 is capable of clearing the trip log counter within a DST100 depth/speed/temperature transducer. You zero the trip log by pressing the Enter key ( 
) with the “Trip Log:” menu item selected which results in the screen shown Figure 79. Pressing the Accept ( 
) key while the
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