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DSM250 User’s Manual
Page 88 Revision 1.4.16a
such that all subsequent measured STW readings are no longer adjusted before begin transmitted
over the NMEA 2000
®
network.
6.10.3 Speed Calibration
The DST110 speed through water (STW) initial accuracy is significantly affected by the location or
placement of the DST110 within the hull. The DST110 can be corrected for these inaccuracies using
the speed calibration procedure. You calibrate the DST110 STW by pressing the Enter key ( ) with
the “Speed Calibration…” menu item selected which results in the screen shown in Figure 77.
Figure 83 – Calibrating the DST110 Speed
The speed calibration screen shown in Figure 77 indicates the STW as measured by the DST110,
which can be changed to the transmitted STW by following these steps. First, pick a speed where you
are most concerned with the best accuracy. Next, bring the boat up to the desired speed using some
other source, perhaps the GPS speed over ground (SOG). Remember that the SOG does not
necessary reflect the STW because of currents, and drift due to winds, so you should do this in an
area where you are sure there are no currents and calm winds. Finally, use the Increase ( ) and
Decrease ( ) keys to adjust the display value until it matches the known speed of the boat. Press
the Accept ( ) key to accept the value when you are satisfied. If you do not wish to perform speed
calibration at this time, press the Abort ( ) key and the speed calibration will not be altered.
6.10.4 Clear Temperature Offset
The Clear Temperature Offset configuration parameter shows you the currently used temperature
correction offset. All measured sea temperature readings have this value added to them before being
transmitted over the NMEA 2000
®
network. You can set the correction offset to zero by pressing the
Enter key ( ) with the “Clear Speed Calibration:” menu item selected. And then choose “Clear”
using Scroll Up ( ) or Scroll Down ( ) keys followed by the Enter key ( ). This changes the
correction factor back to 0 such that all subsequent measured sea temperature readings are no
longer adjusted before begin transmitted over the NMEA 2000
®
network.