Garmin GPSMAP 695/696 Owner’s Manual190-00919-00 Rev. GAppendix H247Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices IndexMAP DATUM AND LOCATION FORMATSMAP DATUMSA datum is a mathematical model of the Earth that approximates the shape of theEarth and enables calculations to be carried out in a consistent and accurate manner.The datum is physically represented by a framework of ground monuments (such astrig. stations) whose locations have been accurately measured and calculated on thisreference surface. Lines of latitude and longitude on a chart are referenced to a specificmap datum. Every chart has a map datum reference and the GPSMAP 695/696 can beset to match most of those commonly used.LOCATION FORMATSYour current location can be viewed on the GPS in the form of coordinates. Sincedifferent charts use different location formats, Garmin GPS units allow you to choosethe correct coordinate system for the type of chart you are using. The most commonformat is latitude and longitude, which is used by all Garmin units. You can change thelocation format to use with other coordinate systems. Several other grids, including auser-definable grid (for the advanced user), are available.
