Raymarine ST70 Installation Guide download pdf (Page 26)

20 ST70 Instrument User Reference Manual

If there is any inaccuracy after you have completed the Align Vane procedure, then:

1. At the

Wind

transducer setup menu, select

Vane

Adjust

, to display the

Vane Adjust

screen.

2. Sail the boat directly into the wind, then use

and

to manually set the wind reading to zero.

3. Press

ENTER

to accept the value and return to

the

Wind

transducer setup menu.

4. Press

CANCEL

to return to the

Transducers

found

menu.

Calibrate wind speed

To set the correct apparent wind speed reading:

1. With the

Wind

transducer setup menu

displayed, use

to scroll to

Calibrate AWS

then press

ENTER

to display the

Calibrate AWS

screen.

2. Use

to adjust the Calibration Factor so that

the AWS value in the information box is set to the

correct value.

3. Press

ENTER

to accept the value and return to

the

Wind

transducer setup menu.

4. Press

CANCEL

to return to the

Transducers

found

menu.

Speed calibration

The object of speed calibration is to ensure that the speed readings at the ST70

instruments are true indications of the boat speed, ideally over the speed range of the

vessel, i.e. from stationary to top speed.

In order to take into account the changes in water-flow characteristics across the hull,

for different speeds, it is advisable carry out speed calibration at as many speeds as

possible, up to the maximum of five, provided by ST70. This is particularly

important for planing vessels.

The correct calibration at each speed is achieved by applying a calibration factor to

the indicated speed reading. The correct value for the calibration factor is obtained by

one of two methods:

• If SOG information is available, you can use this as a reference, to enable you to

set the correct calibration factor.

• If SOG information is not available, you need to manually calculate and apply the

correct calibration factor.

In order to achieve accurate results, speed calibration must be carried out in

conditions of zero tide and zero current.

Carry out the Start speed calibration procedure (page 21) followed by the Set to SOG

or Manual calibration procedure, as required.

D10079-1

Manually adjust your vane offset.

Press ENTER to accept

Vane Adjust

15°

AWA 105° P

D10366-1

See Docs for Manual Calibration.

Calibrate AWS

AWS: 3.2 KTS

0.73

Calibration factor

AWS value

81284_1.book Page 20 Friday, May 4, 2007 7:29 AM

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Raymarine ST70 Installation Guide Page 26

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