Garmin GPS 165TSO Pilot's Manual

Contents

The GPS 165 contains over 100 map datums for you to use when navigating. Bydefault, your unit calculates positions using the WGS-84 map datum. If you are usingcharts based on another datum, you must set the GPS 165 to use the same datum.Using a map datum that does not match the sectionals you are using can result in sig-nificant differences in position information. If you are using maps for reference only,the GPS 165 will provide correct navigation guidance to the waypoints contained inthe database regardless of the datum selected.To change the map datum to one listed in Appendix E:1. Press S and use O to display the ‘Map datum’ page.2. Press C.3. Use O to highlight the current map datum.4. Use K to change the datum.5. Press C to complete.To create a user datum:1. Press S and use O to display the ‘Map datum’ page.2. Press C.3. Use O to highlight ‘Define user datum?’. Press E.4. Enter the 5 parameters of the map datum using K and O. Press E to accept a field.The signs of each value (+/-) should follow the convention: WGS84-local geodetic system.5. Use O to highlight ‘ok?’ and press E.6. To activate the user datum, select ‘USER’ on the map datum page as described above.93UNIT SETTINGSUsing Map DatumsDefining user map datum.Map Datum Page.