Furuno DS-80 User Manual

Page 21

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.