Ce­les­tial Eval­u­a­tion

Cruising World - - Boats & Gear -

Cross-check­ing your com­pass off­shore is con­sid­er­ably harder than in­shore, of course, be­cause there are no fixed vis­ual ref­er­ences. But com­pass ad­juster Bill Haines, owner of Is­land Marine In­stru­ment in Everett, Wash­ing­ton, says nav­i­ga­tors can use their bin­na­cle com­pass’ shadow pin to de­ter­mine if their com­pass has gone sig­nif­i­cantly askew. “When the sun is low in the sky, it casts a shadow across the com­pass,” says Haines. “Where the shadow falls is the re­cip­ro­cal of the sun, so you go into your ce­les­tial ta­bles and de­ter­mine the az­imuth an­gle of the sun, and then you can de­ter­mine if your com­pass is ac­cu­rate.”

Newspapers in English

Newspapers from USA

© PressReader. All rights reserved.