Chapter 8
GTD-110/150
Trouble shooting
8-2
93151542-00
8.2.4 Own ship’s position (lat/lon) is deviated from actual position on the chart.
A1: Select GPS/DGPS => DATUM and confirm that the datum selected agrees with the chart in use.
A2: Check if the position correction mark is shown. If it is shown, positional correction is in effect. Undo
this function by the following method:
(1) Select DISPLAY SETTINGS => POSITION DATA DISPLAY and incorporate positional corrections.
(2) Select SYSTEM SETTINGS => SYSTEM SETTING(2/2) => CORRECTION and select NO.
8.2.5 Own heading course is not correct
A1: Check if the heading direction is selected to the desired one. To do this, select DISPLAY
SETTINGS => COURSE DISP and check if a suitable bearing is selected.
A2: In case own ship speed is less than 1 knot, the heading bearing tends to fluctuate.
8.2.6 Speed response is too slow
A1: If the speed averaging is applied, speed indication update becomes slow. As long as the fast speed
update is required, undo this function by selecting AVERAGE SPEED NO in the SYSTEM
SETTING(!/2). If the speed averaging is still necessary, select an appropriate index (AVERAGE
NUMBER).
A2: Check if the GPS/DGPS averaging constant is set to 3. Select GPS/DGPS SETTINGS =>
GPS/DGPS SETTINGS and select AVERAGE 3.
8.2.7 Old ship’s track is erased
A: Check if the number of plots shown in the right bottom of the screen has reached the maximum 7000.
If YES, the oldest track is erased on a first-in-first-out basis. You should save an important track
record by referring to Para5.4.6 “Storing ship’s track” and then perform the erasing procedure
described in Para 5.4.8 “Deleting a ship’s track by specifying color” or 5.4.9 “Deleting a ship’s track
by specifying an area”.
8.2.8 Backup battery life
When the message “Backup battery cell. Replacement need” is shown after the unit has been turned
on, you need to replace the backup battery immediately. It is near the end of its life. Contact your
nearest KODEN dealer for replacement. Even if the battery life is terminated, the registered mark data
and ship’s track data are stored in the non-volatile memory and protected from erasure. However, new
track data and mark data cannot be added.