3.3 Calibrating NMEA Depth, Speed and Water
Temperature Data
NMEA speed, depth and water temperature data may be corrected from the GP-7000 if they
cannot be done from the equipment that outputs the data. Enter a minus value if the actual
value is lower than the NMEA data, or a plus value if the actual value is higher than the
NMEA data. For example, if the actual water temperature is 20° and the water temperature
data output by the sensor is 17°, enter +3(°).
1. Press the [MENU] key to show the menu bar.
2. Rotate the [ENTER] knob to choose ADVANCED from the menu bar and then push the
[ENTER] knob.
3. Rotate the [ENTER] knob to choose EXT NMEA and then push the [ENTER] knob.
DRAFT SETUP +00.0 Ft
SPEED CALIBRATION +00 %
TEMP CALIBRATION +00.00 F
EXT NMEA menu
4. Rotate the [ENTER] knob to choose appropriate item.
DRAFT SETUP: Enter ship’s draft to get NMEA depth from sea surface (instead of
transducer).
SPEED CALIBRATION: Enter offset in percentage points to correct NMEA speed
indication.
TEMP CALIBRATION: Enter offset to correct NMEA water temperature indication.
5. Push the [ENTER] knob. The cursor is selecting the plus sign (or minus sign). If it is
necessary to switch from plus to minus or vice versa, rotate the [ENTER] knob to
choose plus or minus and then push the [ENTER] knob. If not necessary, go to step 6.
6. Push the [ENTER] knob, rotate the [ENTER] knob to set digit and then push the
[ENTER] knob. To clear a line of data, press the [CLR FLD] soft key, which is the third
key from the left of the keys below the screen.
Setting range
Draft setup: -20 - +39.9(ft)
Speed calibration: -50 - +50(%)
Temp calibration: -50 - +50(°F)
7. Set other digits as you did in step 6.
8. Press the [SAVE] soft key, which is the fourth key from the left of the keys below the
screen.
9. If necessary, repeat step 4-8 to choose and set another calibration item.
10. Press the [MENU] key to close all open windows and erase the menu bar.
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