Simrad GC80 Compact MK2, User Manual, Page: 51 / 156

MAINTENANCE
37 988-12720-002
Adjusting the Rotor balance
After replacing a Sensitive element, it is very important to verify the rotor
balance. If necessary, adjust the rotor balance. On the Sensitive element,
the reference level tool is mounted on the opposite side of the blue plug.
When the compass has been running continuously for at least 3 hours, the
balancing process can start.
1 The reference center of the rotor level depends on the latitude, ref.
graph on next page.
2
The rotor level can only be balanced/adjusted using the “Theta Offset”
parameter (1.6.t in the extension menu A-1). The Bubble will react
when the value is changed. However, it will take at least 1 hour before
it is stabilized. The Bubble level should be checked again after 24
hours and adjusted if needed. The rotor level must be /-14
minutes from the reference center.
Increase Theta Offset = Bubble towards NORTH
Decrease Theta Offset = Bubble towards SOUTH
Note!
The Theta Offset should not be changed more than +/-0.1 from the
element’s original parameter value.
3 If the rotor level bubble still touches the end of the reference level tool
after 3 hours, even if the Theta Offset value is correct according to
parameter list/label, the Sensitive element is damaged and must be
replaced.