User manual GARMIN GPS 55AVD

[. . . ] GPS 55 AVD Personal NavigatorTM OWNER'S MANUAL © 1992 GARMIN, 9875 Widmer Road, Lenexa, KS 66215 Printed in Taiwan. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose without the express written permission of GARMIN. Information in this document is subject to change without notice. GARMIN reserves the right to change or improve their products and to make changes in the content without obligation to notify any person or organization of such changes or improvements. October, 1992 190-00030-00 Rev. [. . . ] You may select true, automatic magnetic, or user magnetic heading correction for all track, course, and heading information. If you select true heading, all information displayed on other pages will be referenced to the true North pole. If you select automatic magnetic heading, all information will be corrected with the magnetic variation computed by the GPS 55. If you select user magnetic heading, all information will be corrected by the magnetic variation you enter. 4-5 To select true heading. . . · With the cursor under the heading mode select field, press MORE until "TRUE HDG" is displayed. · With the cursor under the heading mode select field, press MORE until "AUTO MAG" is displayed. The computed magnetic variation at the present position will be displayed. · With the cursor under the heading mode select field, press MORE until "USER MAG?" is displayed. · With the cursor under the magnetic variation field, enter the desired value. (If the direction [E, W] is incorrect, press CLR until the correct direction is displayed, then enter the numeric value. ) 4. 9 FILTER SETTINGS Position/ Velocity Select Filter Response Time Select FILTER SETTINGS PAGE The GPS 55 allows you to choose the filter response time for position and velocity outputs. This may aid you in smoothing the data in rough seas or for sail boating. · With the cursor under the position/velocity select filter, press MORE to select "VEL" or "POSN". · Press MORE to select FAST (3 seconds), MED (20 seconds), SLOW (120 seconds), or AUTO. Typical users will want to choose the "Auto" setting for optimal position and velocity filtering. This will allow the GPS 55 to respond quickly to changes in heading and speed while providing smooth data during cruise. 4-6 4. 10 OUTPUTS Output Select OUTPUT PAGE You may select the output data format for your interface requirements. · Press MORE until the desired output format is displayed. "NMEA 0180", "NMEA 0182" (also known as NMEA 0180 Complex) and "NMEA 0183" are available for interfacing with other electronic devices (see Appendix C for more information on NMEA interfaces). Alternatively, you may select "NO OUTPUT" if you do not use the interface (this will help extend battery life). 4. 11 MAP DATUM Map Datum Select MAP DATUM PAGE The GPS 55 calculates your position based on the WGS-84 map datum. If your charts (or other electronic devices) are created using a different datum, you must set the GPS 55 map datum for consistency (a position in the WGS84 datum could differ by 1000 feet or more from one calculated using another datum). The GPS 55 provides 101 standard map datums and allows you to enter your own, if necessary. [. . . ] Damage to the case may occur which is not covered by your warranty. The waypoints, routes, custom settings, and other data stored in the GPS 55 are maintained by an internal battery. (These data will not be lost even if you remove the AA or rechargeable battery pack for separate storage. ) The internal memory battery should typically last three to five years. If the GPS 55 detects a low memory battery, you will be informed with the message "MEM BATT". [. . . ]