Garmin aera 500 - Manual (Page 18)

Garmin aera 500 Series Pilot’s Guide 190-01117-02 Rev. A
6
Overview
Overview
GPS Navigation
Flight Planning
Hazar
d
Avoidance
Additional F
eatur
es
Appendices
Index
When the receiver is in the process of acquiring enough satellite signals for
navigation, the receiver uses satellite orbital data (collected continuously from the
satellites) and last known position to determine the satellites that should be in view.
‘Acquiring Satellites’ is indicated as the solution until a sufficient number of satellites
have been acquired for computing a solution.
When the receiver is in the process of acquiring a 3D differential GPS solution, ‘3D
GPS Location’ is indicated as the solution until the 3D differential fix has finished
acquisition.
SATEllITE INFORmATION
Satellites currently in view are shown at their respective positions on a satellite
constellation diagram. The outer circle of the constellation diagram represents the
horizon, the inner circle represents 45° above the horizon, and the center point shows
the position directly overhead. Each satellite is represented by a square containing the
Pseudo-Random Noise (PRN) number (i.e., satellite identification number).
GPS Status can be helpful in troubleshooting weak (or missing) signal levels
due to poor satellite coverage or installation problems. As the GPS receiver locks
onto satellites, a signal strength bar is displayed for each satellite in view, with the
appropriate satellite PRN number (01-32 or 33-64 for WAAS) below each bar. The
progress of satellite acquisition is shown in three stages, as indicated by signal bar
appearance:
- No bar—Receiver is looking for the indicated satellite
- Gray bar—Receiver has collected the necessary data and the satellite signal can
be used
- Green bar—Satellite is being used for the GPS solution