Lowrance NAC-3 Autopilot Computer Network Pilot Installation Manual ACP - Page 86

Magnetic Dip Angle

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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 5 - 17

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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