Simrad AP25 Manuel d'instructions télécharger pdf (Page 166)

Simrad AP25 Autopilot

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9 GLOSSARY

Apparent wind – The speed and direction from which the wind

appears to blow with reference to the bow when the boat is

moving (also called relative wind).

Arrival alarm – An alarm signal issued by a GPS/chartplotter

that indicates arrival at or at a predetermined distance from a

waypoint. (see arrival circle).

Arrival circle – An artificial boundary placed around the

destination waypoint of the present navigation leg, the entering

of which will signal an arrival alarm.

Bearing – The horizontal direction of one terrestrial point from

another, expressed as the angular distance from a reference

direction, usually measured from 000° at the reference direction

clockwise through 359°.

BPW – Bearing to a specified waypoint from present position.

BWW – Bearing waypoint to waypoint - Bearing angle of the

line between the “TO” and the “FROM” waypoint, calculated at

the “FROM” waypoint for any two arbitrary waypoints.

COG - Course Over Ground - The actual direction of progress

of a vessel, between two points, with respect to the surface of the

earth, The vessel’s heading may differ from the course over

ground due to the effects of wind, tide, currents.

GPS - Global Positioning System - This system is based on

satellites in fixed orbits, circling the earth at an altitude of

approximately 20,200 km. The system will provide the user with

24 hour a day all weather position coverage, with an accuracy of

5 to 30 meters.

Magnetic bearing – Bearing relative to magnetic north;

compass bearing corrected for deviation.

Magnetic deviation – A local magnetic field onboard a vessel.

Can interfere with the earth’s magnetic field and create compass

readings that may deviate from the actual magnetic heading. The

deviation will vary with the actual heading.

Magnetic heading – heading relative to magnetic north.

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Simrad AP25 Manuel d'instructions Page 166