B&G Network Autopilot - Manual (Page 86)

5 - 17
MAGNETIC DIP ANGLE
BOATS FASTER THAN 20 KNOTS ONLY
All magnetic compasses are effected by ‘Northerly turning errors’ in the
Northern Hemisphere or ‘Southerly turning errors’ in the Southern
Hemisphere, which increase with boat speed and magnetic dip angle in
higher latitudes. These can cause heading instability at boat speeds
greater than 20 knots when steering with an autopilot. By entering the
dip value indicated on the compensation chart, the autopilot will be able
to correct for these errors and improve the heading stability. Use the
minimum value necessary to stabilise the heading.
MAGNETIC DIP ANGLE COMPENSATION CHART