Furuno GP-7000F - Manual (Page 39)

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3.5 Calibrating NMEA Depth, Speed and Water
Temperature Data
NMEA speed, depth and water temperature data may be corrected from the GP-7000F if they can-
not 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 sen-
sor 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.
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 trans-
ducer). To get depth from hull bottom, measure distance between bottom of transducer and
hull bottom and enter that value with a minus.
SPEED CALIBRATION: Find correct speed from known source and enter offset to correct
NMEA speed indication.
TEMP CALIBRATION: Find correct water temperature from known source and 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.
DRAFT SETUP +00.0 Ft
SPEED CALIBRATION +00 %
TEMP CALIBRATION +00.00
°
F