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3-2
“SRCH SKY”. Additionally, the “DATA” banner will be displayed. Once
satellite orbital data is collected, it will be stored in battery backed up memory.
This means the data will not be lost when you turn your GPS 55 off.
3.2 SATELLITE STATUS
Satellites EPE
Tracked/Visible
Satellite DOP
Identifier
Azimuth Elevation Signal Quality
SATELLITE STATUS PAGE
The Satellite Status Page may be displayed by pressing the SET key. This
page shows the number of satellites tracked and visible, dilution of precision
(DOP), and estimated position error (EPE). DOP is a measure of the satellite
geometry quality and hence the relative accuracy of your position (1 meaning
the best and 10 meaning poor). EPE, which is computed using the satellite
geometry (DOP), signal, and data quality, receiver tracking status and other
factors, is an overall measure of your position accuracy. DOP and EPE are
advisory information only.
The Satellite Status Page also shows the identifier (1-32), azimuth, elevation,
and signal quality of up to eight visible satellites. The azimuth is an angle from
000° to 359° which indicates the bearing from the present position to the
satellite, with 000° representing true north. The elevation is an angle from 00°
to 90° which indicates the height of the satellite above the horizon, where 00°
indicates the horizon and 90° indicates a satellite is directly overhead. The
azimuth and elevation are useful for determining whether a satellite signal is
blocked by buildings, mountains, or other obstructions. The signal quality is
a number from 1 through 9, with 9 indicating the strongest signal. If a satellite
is visible but not tracked, the signal quality will be blank.
The Satellite Status Page will automatically display each satellite’s information
for three seconds. You may also manually scroll through the list of visible
satellites.