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

2. Chapter 28: Measuring Compass Deviation Using GPS

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

4. 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

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

6. Measuring Deviation While You Cruise

7. 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