Lowrance electronic AirMap 1000 User Manual

Page 30

WARNING:

Do not begin navigating with this unit until the numbers
have stopped flashing!

Satellite Page. Left view indicates unit has not locked on to any satellites

and does not have a fix on its position. Center view shows satellites being

scanned. Right view shows satellite-lock on with a 3D position acquired

(latitude, longitude and altitude) and WAAS corrections. The bottom data

box shows either a battery power indicator or a voltage indicator, depend-

ing on what power source is being used.

This screen shows a graphical view of the satellites that are in view.
Each satellite is shown on the circular chart relative to your position.
The point in the center of the chart is directly overhead. The small in-
ner ring represents 45° above the horizon and the large ring represents
the horizon. North is at the top of the screen. You can use this to see
which satellites are obstructed by obstacles in your immediate area if
you hold the unit facing north.

The GPS receiver is tracking satellites that are in bold type. The re-
ceiver hasn't locked onto a satellite if the number is grayed out, there-
fore it isn't being used to solve the position.

Beneath the circular graph are the bar graphs, one for each satellite in
view. Since the unit has twelve channels, it can dedicate one channel
per visible satellite. The taller the bar on the graph, the better the unit
is receiving the signals from the satellite.

The Position Error box (sometimes called EPE for "Estimated Position
Error") is shown in the upper left corner of the screen. This is the ex-
pected error from a benchmark location. In other words, if the Position
Error shows 50 feet, then the position shown by the unit is estimated to
be within 50 feet of the actual location. This also gives you an indicator
of the fix quality the unit currently has. The smaller the position error
number, the better (and more accurate) the fix is. If the position error
flashes dashes, then the unit hasn't locked onto the satellites, and the
number shown isn't valid.