Garmin GPSMAP 175 Owner's Manual

Garmin GPSMAP 175 Owner's Manual Manual pdf 86 page image

APPENDIXDefinitionsDAlmanac Data—The satellite constellation information (including location and healthof satellites) that is transmitted to your receiver from every GPS satellite. Almanac datamust be acquired before GPS navigation can begin.Bearing (BRG)—The compass direction from your position to a destination.Course Over Ground (COG)—Direction of movement relative to a ground position.Crosstrack Error (XTK)—The distance you are off a desired course in eitherdirection.Desired Track (DTK)—The compass course between the ‘from’ and ‘to’ waypoints.Differential GPS (DGPS)—An extension of the GPS system that uses land-basedradio beacons to transmit position corrections to GPS receivers.Estimated Time of Arrival (ETA)—The time of day of your arrival at a destination.Estimated Time Enroute (ETE)—The time remaining to your destination at yourpresent speed.Grid—A coordinate system that projects the earth on a flat surface, using square zonesfor position measurements.Ground Speed (SOG)—The velocity you are traveling relative to a ground position.Latitude—A north/south measurement of position perpendicular to the earth’s polaraxis.Longitude—An east/west measurement of position in relation to the Prime Meridian,an imaginary circle that passes through the north and south poles.Position—An exact, unique location based on a geographic coordinate system.82The GPSMAP 175 usesan on-screen messageprompt to alert you toimportant information.Whenever a messageappears, press the Jkey to view the message.