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Simrad GC80/85 Dual MK2 Gyro Compass
6.8
Balancing the Horizontal ring
Note!
WARNING
988-12720-002
5
If Manual input source is selected, the display will change to show
flashing numerical values.
6
Use the ARROW buttons to enter the speed value, and confirm the
input by pressing the ACK/ENT button.
7
The display will return to show speed value and speed input source
without flashing.
After the compass has been running continuously for at least 2 hours, the
Horizontal ring should be adjusted.
1
Locate the reference level tool on the Horizontal ring, and check that
the level bubble is within +/-5 minutes from the center. Each
division equals 2 minutes.
2
If the level bubble is not within this limit, add or remove weights
from the Horizontal ring until it is leveled.
It is important that there are as few weights as possible on the Horizontal
ring.
3
Let the compass run for at least 20 minutes before the level is
rechecked and eventually confirmed.
If the Horizontal ring is tilted more than +/-5', a bearing
error will be generated!
Adjusting True heading
After the GC80/85 is settled, the Gyro compass has to be calibrated against
an external reference, e.g.:
-
a known target
-
astronomical observation
-
the heading of the pier or quay the vessel is moored to
-
2 fixed points on the chart that the vessel is sailing between
The observation period for the heading difference should be as long as
possible.
66
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