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15-8
Garmin GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. B
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
As the GPS receiver locks onto satellites, a signal strength bar appears for each
satellite in view, with the appropriate satellite number (01-32, SBAS satellites will
have higher numbers) underneath each bar. The progress of satellite acquisition
is shown in three stages:
Graph Symbol Description
No signal strength bars The receiver is looking for the satellites indicated.
Grey signal strength bars
The receiver has found the satellite(s) and is collecting
data.
Yellow signal strength bars
The receiver has collected the necessary data but the
satellite is not being used in the position solution as it
has been excluded.
Cross-hatch cyan signal
strength bars
The receiver has found the satellite(s) but it has been
excluded by the FDE program as a faulty satellite.
Solid cyan signal strength
bars
The receiver has collected the necessary data, but is
not using the satellite in the position solution.
Solid green signal strength
bars
The receiver has collected the necessary data and the
satellite is being used in the position solution.
D
The “D” character inside the bars indicates differential
corrections (e.g. WAAS) are being used for that
satellite.
Table 15-2 Signal Strength Bar Graph Description
The Time and other data may not be displayed until the unit has acquired
enough satellites for a fix.
The sky view display at the left of the page shows the satellites currently in view
as well as their respective positions. The outer circle of the sky view represents
the horizon (with north at the top of the circle); the inner circle represents 45°
above the horizon and the center point shows the position directly overhead.
Each satellite has a 30-second data transmission that must be collected
(hollow signal strength bar) before the satellite may be used for navigation (solid
signal strength bar). Once the GPS receiver has determined your position, the
GTN unit indicates your position, altitude, track and ground speed. The GPS
receiver status field also displays the following messages under the appropriate
conditions: