Users should be aware that ENA have limitations and have been known to provide erroneous information. Reliable and accessible alternatives for back up and cross reference should always be readily available. A correctly installed and adjusted magnetic compass, of a size and type suitable for the vessel, fulfills this requirement. Other uses for a magnetic compass. It is, however, worth taking the following into consideration:. Entering the wrong datum can put the vessel's position miles from where it really is. When GPS shows a compass course, it is not showing the ship's heading, it is showing the track of the vessel - where she has been in relation to her current position.
How to Use a Boat Compass (Complete beginners guide)
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A built-in correcting magnet system, standard on all compass models, consists of two sets of magnets fixed to two adjusting rods with slotted ends. The slots should be horizontal before starting the adjusting procedure. A small non-magnetic screwdriver is provided for this purpose. On bracket and deck models, the black plastic inserts must be removed to gain access to the slotted compensator rod ends.