Differential Gps Traffic Light Operation; Red Flashing; Red/Yellow Solid; Red Solid - NorthStar MX500 Operator's & Installation Manual

Operator's Manual

Differential GPS Traffic Light Operation:

Red Flashing

Not tracking satellites (no position update). This is normal for the
first 2 minutes or so when turning the unit on. The very first time you
turn the unit on, or if the memory is reset or lost, this condition is
also normal. Allow the receiver to run for at least 30 minutes under
these circumstances. If it still does not change to Red Solid, refer to
the troubleshooting section in the Appendix F of this manual.

Red/Yellow Solid

Dead Reckoning . When normal GPS or DGPS operation is not avail-
able, this LED sequence is provided to quickly identify the DR navi-
gation mode. A DR indicator is also displayed on all screens.

Red Solid

Tracking one or more satellites (no position update). This is also
normal for the first 2 minutes or so when turning the unit on. The
very first time you turn the unit on, allow the receiver to run for at
least 20 minutes after changing to Red Solid to collect an almanac
from the satellites, regardless of whether a position update has been
calculated or not. This is also a normal indication if the HDOP is
greater than 10, if the receiver is tracking too few satellites, or for
other reasons as well. Read the GPS and DGPS function screens for
more information.

Yellow/Green Solid

GPS position update; DGPS corrections are not being received.
!
You may see this from time to time during normal operation. It usu-
ally occurs when the beacon signal is not available (either it is being
blocked by terrain or a local object or you are out of range of the
transmitter) and/or you are tracking 3, 4, or 5 satellites, and the sat-
ellites have poor geometry relative to your position. The condition
will normally go back to green solid, when it picks up another bea-
con station. The factory default level for dropping DGPS corrections
is 600 seconds. During this period, your positioning information is
less than optimal, and position accuracy may be off by as much as 3
to 5 meters. Press the GPS function key and refer to the DGPS sec-
tion in this manual for guidance if this light condition occurs.
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Keypad & Display Description
Version 3.0