GPSMAP 495 Owner’s Manual
5
Getting Started >
Getting Satellite Signals
GPS Page
Receiver
status field
Sky view
Signal
strength
bars
Power
source
indicator
The progress of satellite acquisition is shown in three stages:
No signal strength bars
—the receiver is looking for the
satellites indicated.
White signal strength bars
—the receiver has found the satellite
and is collecting data.
Green signal strength bars
—the receiver has collected the
necessary data from this satellite.
As soon as the GPSMAP 495 has collected the necessary data from
the best satellites in view to calculate a fix, the status field indicates
the status of the receiver. The unit then updates the location, date,
and time.
Receiver Status
The Receiver Status field shows one of the following conditions:
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Searching the Sky
—the receiver is looking for satellites.
AutoLocate
—the receiver is looking for any satellite whose
almanac has been collected, which can take up to 5 minutes.
Acquiring Satellites
—the receiver is looking for and collecting
data from satellites visible at its last known or initialized
location, but has not acquired a fix.
2D GPS Location
—At least three satellites have been acquired
and a two-dimensional location fix has been calculated. “2D
Differential” appears when you are receiving DGPS corrections
in 2D mode and a “D” appears on the strength bar of satellites
being corrected.
3D GPS Location
—At least four satellites have been
acquired and a three-dimensional fix has been calculated. “3D
Differential” appears when you are receiving DGPS corrections
in 3D mode and a “D” appears on the strength bar of satellites
being corrected.
Lost Satellite Reception
—the receiver is no longer tracking
enough satellites for a 2D or 3D fix.
Receiver Not Usable
—the receiver is unusable, possibly due to
interference or abnormal satellite conditions. Turn the unit off
and back on to reset.
Simulating GPS
—the receiver is in Simulator Mode.
GPS Off
—the GPS receiver is turned off.
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