Furuno DS-80 manual Correction Factor for Analog Display MF-22A-1

ANALOG DISPLAY UNIT

CORRECTION DIAGRAM AT EXTREME TEMPERATURES

Doppler Speed Log DS-80

CORRECTION FACTOR FOR ANALOG DISPLAY MF-22A-1

Example:

If the analog speedometer reads 14.2 kt at a temperature of –15°C, the correct speed through the water is 15 kt. Failure of correction in low temperature can result in a maximum error of –0.8 kt or 5.3% for 14.2 kt readout. IMO limit of ± 2% is exceeded over 10.0 – 30.0 kt reading but correction by this graph brings a correct measurement.

At +55° C, an error of +0.0 kt (+2.7%) occurs at a speed of 30 kt; no other point IMO limit of

±2% is exceeded.

When the digital display and analog display readouts are different, take precedence of the digital readout. At temperatures 0° C to 50° C, the speedometer never exceeds the IMO limits.

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