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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.
When the GPSMAP 378/478 collects the necessary data from the
best satellites in view to calculate a x, the status eld indicates the
status of the receiver. The unit then updates the location, date and
time.
Receiver Status
The Receiver Status eld shows one of the following conditions:
Searching the Sky—the receiver is looking for satellites.
AutoLocate—the receiver is looking for any satellite whose
almanac was collected, which can take up to ve 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 x.
2D GPS Location—At least three satellites were acquired
and a two-dimensional position x was 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 were acquired
and a three-dimensional x was 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 x.
Receiver Not Usable—the receiver is unusable, possibly due
to interference or abnormal satellite conditions. Turn the unit
off and back on to reset it.
Simulating GPS—the receiver is in Simulator Mode.
GPS Off—the GPS receiver is turned off.
GPSMAP 378/478 Owner’s Manual 5
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