7-2-22 Section 7: System Setup
ST290 Instrument System Owner’s Handbook
ing value.If you are using this method, you should do so in condi-
tions of zero tide and current, to ensure that COG is accurate.
3. Check the heading reading against a number of known headings, and
calculate the lowest average alignment error.
4. Adjust the reading on the ALIGN HEADING screen to remove the aver-
ageerrorvalue,calculatedinstep3.
Note: If the average heading error is more than 5°, you should perform
the compass deviation correction procedure again, circling more slowly
and in more favorable conditions.
Setting system variation
On a SeaTALK
2
system, only one product can define the magnetic
variation. This product is designated as the ‘variation master’. All other
products are ‘slaves’ and use the variation value set by the master.
If no other product on the SeaTALK
2
system is allocated as a master, you
should designate one ST290 Graphic Display as the master and carry out
all setting up from this instrument. All other instruments on the system
should be set as slaves.
Slave
To set an instrument as a slave:
1. Select the SYSTEM VARIATION page (see Figure 2-22 ).
2. If the MASTER/SLAVE indicator is not SLAVE:
i. Use the or button to highlight the MASTER/SLAVE field.
ii. Hold down the button for 1 second to enter edit mode. The
MASTER/SLAVE indicator flashes.
iii. Use the or button to set the MASTER/SLAVE indicator to
SLAVE.
iv. Hold down the button for 1 second to save the setting.
Master
To set the system variation at a master instrument:
1. Select the SYSTEM VARIATION page (see Figure 2-22 ).
2. If the MASTER/SLAVE indicator is not MASTER:
i. Use the or button to highlight the MASTER/SLAVE field.
ii. Hold down the button for 1 second to enter edit mode. The
MASTER/SLAVE indicator flashes.
81183_2 S7.book Page 22 Wednesday, May 7, 2003 1:52 PM
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