1. Typical Compass ConstructionB

2. Read a Compass at the Lubber’s Line

3. Compass Installation B

4. Variation Changes With Geographic PositionB

5. Calculating a Steering Course
True is the “Language” of the chart
Magnetic is the “Language” of the
compass B

6. Deviation is assumed to be 0 ° for demonstration only
The TVMDC Formula
True Course T
Variation V
Magnetic Course M
Deviation D
Compass Course C
Add
East
Subtract
West
Add
West
Subtract
East
Deviation is assumed to be 0 ° for demonstration only B