Garmin GPSMAP 60Cx Owner's Manual

Also see for GPSMAP 60Cx: Declaration of conformity Specification Owner's manual Quick start guide Guide de l'utilisateur

Contents

Garmin GPSMAP 60Cx Owner's Manual Manual pdf 92 page image

Map Datums and LocationFormatsMap Datums are based on amathematical model of the Earth.What Are Map Datums?A datum is a mathematical model of the Earth thatapproximates the shape of the Earth, and enablescalculations to be carried out in a consistent andaccurate manner. The datum is physically representedby a framework of ground monuments whosepositions have been accurately measured andcalculated on this reference surface. Lines of latitudeand longitude on a map or chart are referenced to aspecific map datum. Every chart has a map datumreference and the GPSMAP 60Cx can be set to matchmost commonly used datum (data).If you are navigating and comparing the GPScoordinates to a map, chart, or other reference, set themap datum in the GPS unit to the same datum as themap to ensure the most accurate navigation.What Is a Location Format?Your current location is viewed on the GPS in theform of coordinates. Because different maps andcharts use different location formats, Garmin GPSunits allow you to choose the correct coordinatesystem for the type of map you are using. The mostcommon format is latitude and longitude, which isused by all Garmin units.You can choose to change the location format for othercoordinate systems. UTM/UPS (Universal TransverseMercator/Universal Polar Stereographic) projectionformats are easy-to-use metric grids that are found onmost USGS topographic quadrangle maps. You canalso select one of several other grids, including a user-definable grid (for the advanced user).2 GPSMAP 60Cx Owner’s ManualAPPendIx > MAP dAtuMs And locAtIon forMAts