Furuno FCV-1150 - Manual (Page 24)

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3. Press T to select "Temp" and then press the ENTER key.
Temperature calibration screen
4. Press T or S to set the value for the temperature calibration and then press the ENTER key.
For example, if the temperature indication is 2.5 °C higher than the actual value,
set “-2.5 °C”.
5. To calibrate the speed value, press T to select "Speed(STW)" and then press the ENTER key.
6. Press T or S to set the value for the speed calibration and then press the ENTER key.
For example, if the speed indication is 5% lower than the actual value, set +5%.
7. To close the menu, press the MENU/ESC key twice.