Red Solid; Yellow Solid; Green Solid; The Display - Leica MX400 Operating Instructions Manual

Keypad & Display Description
available, this LED sequence is provided to quickly identify the DR
navigation 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
! 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. The HDOP value can be read in the GPS function
screens.

Yellow Solid

GPS position update has a 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. If you are patient, the condition
will normally go back to Green Solid, when you pick up another
satellite, or the geometry 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 75 to 300
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

GPS position update with HDOP value less than 4. This is the
normal operating condition. Position accuracy is normally between
40 to 75 meters, but can be out as much as 100 meters. Keep in
mind that position accuracy is always only as good as the geometry
of the satellites and the navigation information provided by the
satellites.This is the normal operating condition and no icon will be
displayed.
Note: If you or a crew member changes the
DGPS mode to Off in the CFG1 DGPS
!
screen, will also have a LED which is
green.

The Display:

Version 3.3
Operator's Manual
13