Garmin GPS III A Owner's Manual

Also see for GPS III: Declaration of conformity Quick guide Owner's manual Owner's manual

Position SettingsPosition Format is used to change the coordinate system in which a given positionreading is displayed. The default format is latitude and longitude in degrees and minutes(hddd°mm.mmm’). The following additional formats are available:• hddd.ddddd° — latitude/longitude in decimal degrees only• hddd°mm’ss.s” — latitude/longitude in degrees, minutes, seconds• UTM/UPS — Universal Transverse Mercator / Universal Polar Stereographic grids• British Grid • German Grid• Irish Grid • Swedish Grid• Swiss Grid • Taiwan Grid• MaidenheadMap Datum allows you to select the datum reference used to determine where a givenposition is. The default setting is ‘WGS 84’. Although over 100 datums are available (aslisted on page 82), you should only change the datum if you are using a map or chartthat specifies a different datum. If no datum is specified, you may select each datumapplicable to your region until you find the datum that provides the best positioning at aknown point.WARNING: Selecting the wrong map datum can result in substantial position errors.When in doubt, use the default WGS 84 datum for best overall performance.To change the position format and/or map datum:1. Highlight the ‘Position Format’ or ‘Map Datum’ field and press ENTER.2. Select the desired setting (using the rocker keypad) and press ENTER.Only the latitude/longitude,UTM/UPS and Maidenheadsettings apply worldwide. Theadditional grid settings areonly valid for a specific region.Over 100 different datumsare provided to allow the GPSIII to correspond to variouspaper charts/maps. Use WGS84 unless your chart specifiesotherwise.74REFERENCESetup Menu: Position#!