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

82 GPSMAP 60Cx Owner’s ManualAPPENDIX >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 of those commonly used.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 insure the most accurate navigation.What is a Location Format?Your current location can be viewed on the GPS in theform of coordinates. Since different maps and chartsuse different location formats, Garmin GPS unitsallow you to choose the correct coordinate systemfor the type of map you are using. The most commonformat is latitude and longitude, which is used by allGarmin units.You can choose to change the location format to usewith other coordinate systems. UTM/UPS (UniversalTransverse Mercator/Universal Polar Stereographic)are easy-to-use metric grids that are found on mostUSGS topographic quadrangle maps. You can alsoselect one of several other grids, including a user-definable grid (for the advanced user).