Lowrance electronic 500 - Manual (Page 26)

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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 of the screen shows a battery power indicator
with "E" for empty and "F" for full. The light bulb indicates the backlight is on.
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 EPE, "Estimated Position Error" (horizontal position error) shown
in the upper right corner of the screen is the expected error from a
benchmark location. In other words, if the EPE shows 50 feet, then the
position shown by the unit is estimated to be within 50 feet of the ac-
tual 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.