User manual GARMIN GPS 38

[. . . ] Owner's Manual & Reference GPS 38 Personal Navigator ® Software Version 3. 0 or above © 1997 GARMINCorporation 1200 E. 151st Street, Olathe, KS USA 66062 Tel: 913-397-8200 or 800-800-1020 Fax: 913-397-8282 Web Site Address: www. garmin. com GARMIN (Europe) Ltd. SO51 9AQ Tel: 011-44-1794-519944 Fax: 011-44-1794-519222 All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or manual, including photocopying and recording, for any purpose without the express written permission of GARMIN. [. . . ] A TracBack route from your present position to the oldest track log point will be created as the active route (the active route page will appear), and provide steering guidance to each waypoint back to the starting point of your track log. Highlight the `TracBack' prompt and press ENTER to begin TracBack navigation. An on-screen status box will monitor the progress of the TracBack calculation. 29 REFERENCE Tips on Creating and Using the TracBack Feature The GPS 38's TracBack feature is designed to help you quickly create and activate a route that follows your path back to a user-defined starting point. To get the most out of the TracBack feature, remember the following tips: · Always clear your track log at the exact point that you want to go back to (trail head, truck dock, etc. ). · The `RECORD' option on the track log setup page must be set to the `Yes' position. · There must be at least two track log points stored in memory to create a TracBack route. · If there are not enough available waypoints in memory to create a TracBack route, you will be alerted with a `waypoint memory full' message, and the receiver will use any available waypoints to create a TracBack route with an emphasis on the track log closest to the destination (the oldest track log point in memory). · If the `CRITERIA' option on the track log setup page is set to a time interval, the TracBack route may not follow your exact path (keeping the criteria set to automatic will always provide the best TracBack route). · If the receiver is turned off or you lose satellite coverage during your trip, the TracBack route will simply draw a straight line between any point where coverage was lost and where it resumed. · If the changes of direction and distance of your track log are very complex, 30 waypoints may not be enough to accurately mark your exact path. The receiver will then assign the 30 waypoints to the most significant points of your track, and simplify segments with fewer changes in direction. TracBack Navigation The TracBack feature will navigate your track log back to the oldest point in the receiver's memory. The track log will be divided into segments with temporary waypoints to create a route back to the beginning of the track log. · If you want to save a TracBack route, copy route 0 to an open storage route before activating another TracBack. Activating another TracBack or storage route will overwrite the existing TracBack route. · Whenever a TracBack route is activated, the receiver will automatically erase any temporary waypoints (e. g. , `T001') that are not contained in routes 1-19. If there are temporary waypoints stored in routes 1-19, the receiver will create any new temporary waypoints using the first three digit number available. 30 Creating and Navigating Routes The last form of navigating to a destination with the GPS 38 is by creating a user-defined route. The route navigation feature lets you plan and navigate a course from one place to another using a set of pre-defined waypoints. Routes are often used when it's not practical, safe or possible to navigate a direct course to a particular destination (e. g. , through a body of water or impassable terrain). Routes are broken down and navigated in smaller segments called "legs". The waypoint you are going to in a leg is called the "active to" waypoint, and the waypoint immediately behind you is called the "active from" waypoint. The line between the "active to" and the "active from" waypoint is called the "active leg". REFERENCE Route Navigation Waypoint 2 ("active to" waypoint) "Active Leg" Waypoint 1 ("active from" waypoint) Whenever you activate a route with the GPS 38, it will automatically select the route leg closest to your position as the active leg. As you pass each waypoint in the route, the receiver will automatically sequence and select the next waypoint as the "active to" waypoint. 31 REFERENCE Route Definition Page The GPS 38 lets you create and store up to 20 routes of 30 waypoints each. Routes are created, copied, and edited through the route definition page, which is accessed through the Menu Page. To select the route definition page: 1. To return to the Menu Page, press P. Comment Field Route Number Creating A Route If you're heading out without a planned route, the mark function can be used to quickly create a route back to your starting point. Create a series of waypoints along the way with the MARK key and save them to an open route from the mark position page. [. . . ] *** Subject to accuracy degradation to 100m 2DRMS under the US DOD-imposed Selective Availability Program. 58 APPENDIX C (UNIT VIEW) Specifications & Wiring Three optional cables are available to connect the GPS 38 to an external power source or interface with another unit or PC: · Cigarette Lighter Adapter (Part No. 010-10084-00) -- Allows connection to a 12 volt DC cigarette lighter plug. The GPS 38 is compatible with the following units: GPS 38/40/45/45XL, GPS II/II Plus and GPS12XL units. Information that can be transferred includes the alamanac, waypoints, routes, and tracklog. [. . . ]