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

Keypad & Display Description

Yellow Solid

DGPS position update with poor HDOP value. You may see this
from time to time during normal operation. It usually occurs when
you are tracking 3, 4, or 5 satellites, and the satellites have poor
geometry relative to your position. The condition will normally go
back to Green Solid when it picks up another satellite or the geom-
etry of the existing satellites improves. The factory default level for
this indication is with an HDOP of 4 to 10. During this period, your
positioning information is less than optimal, and position accuracy
may be off by as much as 5 to 10 meters. You can press the GPS
function key and refer to the GPS section in this manual for guidance
if this light condition occurs.

Green Solid

DGPS position update with HDOP value less than 4. This is the
normal operating condition. Position accuracy is normally better than
3 meters. Keep in mind that position accuracy is always only as good
as the corrections received, their age, your distance from the refer-
ence station, and the geometry of the satellites. This is the normal
operating condition and no icon will be displayed.

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 in the
upper left hand corner of the display.

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
Version 3.0
Operator's Manual
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