Copyright 2008 Coast Guard Auxiliary Association, Inc. The Weekend Navigator Part II Copyright 2008 Coast Guard Auxiliary Association, Inc.

Chapter 28: Measuring Compass Deviation Using GPS

Accurate Compass Navigation Deviation changes with heading Affected by the magnetic field on your boat

Accurate Compass Navigation Noting deviation or compass heading Build a deviation table similar to Figure 28-4 in the text Steer courses based on visual landmarks and label the corresponding compass headings on the chart

Determining Deviation Using GPS Location Conditions Preparation Before you leave the dock Execution Using landmarks in a cross current Without landmarks

Measuring Deviation While You Cruise

Measuring Deviation While You Cruise Monitor GPS track and compass heading Try to stay in the center of the course line GPS track should correspond with the plotted magnetic course direction