Garmin GPS III A Owner's Manual

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Garmin GPS III A Owner's Manual Manual pdf 38 page image

With 2D coverage, you willneed to enter your approxi-mate altitude. Without anapproximate altitude, yourposition error can be substan-tial.The Position Page shows youwhere you are, what directionyou’re heading and how fastyou’re going.30REFERENCE Set 2D Altitude— allows you to designate your approximate altitude, when theGPS III is acquiring satellites or navigating in 2D mode. By default, 2D naviga-tion will attempt to use the last known altitude. If the altitude shown is off byseveral hundred feet (or more), manually entering your approximate altitude willenable the receiver to more accurately determine a position fix.To enter an altitude:1. Highlight ‘Set 2D Altitude’ and press ENTER.2. Enter your approximate altitude using the rocker keypad, and press ENTER.Position PageThe second page in the GPS III’s main page sequence is the Position Page. Thispage shows you where you are, what direction you’re heading, and how fast you’regoing, and it’s most useful when you are traveling without an active destination way-point. The graphic heading display at the top of the page indicates the directionyou’re heading, or track, only while you’re moving.Directly below this display are the speed, average speed, trip timer, trip odome-ter and sunrise/sunset fields (default). The sunrise/sunset times indicated are for yourpresent position. These times, and the current time display in the lower-right corner,can be displayed in local or UTC (universal) time. The lower left-hand corner of thepage shows your current latitude and longitude in degrees and minutes (default). TheGPS III uses this basic information to mark exact positions as waypoints, which helpguide you from one place to another. Average speed, sunrise and sunset times (atyour present position) also appear on the Position Page (as default selections). Unitsof measure and the position readout are selectable from the Main Menu, as outlinedon page 63. ‘Trip Computer’ functions—such as average speed, max speed, tripodometer and trip timer—can each be reset from the Main Menu, as described onpage 64.Satellite Status Page Options