Simrad GC80 Dual MK2 User Manual page 36

Simrad GC80/85 Dual MK2 Gyro Compass
Note!
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
90 80
988-12720-002
In the example above, the figure shows a speed error of appr. 1.1° and the
true bearing should then be 30° - 1.1° = 28.9°.
When the course is within 270° - 0° - 90°, true heading is found by
subtracting the speed error from the compass heading.
If the course is within 90° - 180° - 270°, true heading is found by adding the
speed error to the compass heading.
70
60
LATITUDE (DEGREES)
VESSEL HEADING (DEGREE)
50 40 30 20 10
( )
(+)
(+)
( )
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
0
3.8
22