The Prism is a stripped down racing compass. The Prism provides unprecedented accuracy, coupled with a massive display, in a compact package. At a mere 137 g (4.8 oz) it is the world's lightest racing compass. The Prism uses only magnetic input as its heading reference, has no memory, no user inputs, and performs no arithmetic functions. It's legal in all classes that allow electronic compasses.
The 2021 edition includes up-to-date, consolidated text in line with amendments adopted up to 1 July 2021 and updated unified interpretations that have been keyed to relevant articles and regulations.
A single book providing a complete manual back-up for all celestial navigation needs. The content is identical to the United States Naval Observatory edition.
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