Raymarine ST70 Installation Guide download pdf (Page 28)

22 ST70 Instrument User Reference Manual

6. Use

to select the next calibration speed.

7. Repeat Set to SOG steps 2 to 6, until calibration factor values have been set for all

calibration speeds.

8. Press

ENTER

to save the values and return to the

Speed

transducer setup menu.

9. Press

CANCEL

to return to the Transducers found menu.

Manual calibration

To manually set the correct speed:.

1. Carry out the Start calibration

procedure (above)

2. In conditions of zero tide and zero

current, run your vessel at a steady

speed approximately that of the

selected calibration speed, over a

measured distance.When you do this,

make a note of:

• The current speed value.

• The time it takes to cover the

measured distance.

3. Calculate the actual speed over the measured distance (distance/time).

4. If the calculated speed is:

• The same as the current speed value noted during the calibration run, then the

calibration is correct at this speed, so proceed from Manual calibration step 6.

• Not the same as the indicated speed:

i. Calculate a new, corrected calibration factor, as follows

ii. Press to highlight the calibration factor value field.

iii. Use

to set the displayed calibration factor to the new calculated

value.

5. Repeat Manual calibration steps 2 to 4, until the current speed value displayed

during the calibration run is the same as the calculated speed.

6. Press to highlight the calibration speed field.

7. Use

to select the next calibration speed.

8. Repeat Manual calibration steps 2 to 7, until the calibration factor values are

correct at all calibration speeds.

9. Press

ENTER

to save the values and return to the

Speed

transducer setup menu.

10. Press

CANCEL

to return to the Transducers found menu.

D10323-1

1.8

2 KTS

Calibration

Press ENTER to accept

Calibration factor

Calibration speed

Current

speed

value

See Docs for Manual Calibration.

Speed 1.2KTS

new calibration factor =

indicated speed

actual speed x old calibration facto

81284_1.book Page 22 Friday, May 4, 2007 7:29 AM

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