Garmin 300XL Pilot's Manual And Reference

Garmin 300XL Pilot's Manual And Reference Manual pdf 120 page image

110SECTION7 UNIT SETTINGSMap DatumsThe NavData card contains over 100 map datums for you to use when navigating.By default, your unit calculates positions using the WGS 84 map datum. If you areusing charts based on another datum, you must set the GNC 300XL to use the samedatum. Using a map datum that does not match the charts you are using can result insignificant differences in position information. If you are using maps for referenceonly, the GNC 300XL will provide correct navigation guidance to the waypointscontained in the database, regardless of the datum selected.To change the map datum to one listed in Appendix F:1. Press and hold M, and use O to display the map datum page.2. Press C twice to highlight the current map datum.3. Use K to change the datum.4. Press C to complete.To create a user datum:1. Press and hold M, and use O to display the map datum page.2. Press C twice.3. Use O to highlight ‘Define user datum?’. Press E.4. Enter the five parameters of the map datum using K and O. Press E to accept afield. The signs of each value (+/-) should follow the convention: WGS84-local geodeticsystem.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.User datum page. To use this function you mustenter the parameters as differences from the WGS84 default.Map datum page showing the default WGS 84datum. This setting should be used unless yourpaper chart specifies a different datum.