Why develop a solar compass and deviation card for your vessel?

Bob's Experience that taught him that he NEEDED one.

How to build a sun compass.

...the easiest tool to use in creating a deviation card.

How to use a sun compass to develop a deviation card.

An alternative to using a sun compass would be if you could anchor in line with a known transit, and then use either oars or an outboard to swing the vessel around in a circle.

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