Leica MX400 Operating Instructions Manual page 121

Operator's Manual
receiver navigation solution by the user, regardless of the DoD
health setting. This is accomplished by pressing the E key. Use
the cursor key to move the flashing cursor over the satellite ID
you want to change. Next, press the Force Unhealthy softkey.
There may be circumstances when using a Healthy satellite
actually causes errors in the receiver. For example, a given
satellite might cause your position to have significant errors,
where dropping the satellite would actually improve your
positioning accuracy. In this case you might choose to force the
Healthy satellite to Unhealthy.
h Forced Healthy BY DGPS - This satellite is forced to be used in
the receiver navigation solution by the DGPS reference station
sending corrections to the receiver, regardless of the DoD health
setting. This may occur if the reference station detects that a
satellite marked unhealthy by the DoD is producing valid range
measurements, usable by the receiver.
* Status Unknown - This satellite has no almanac information
available. Normally, you will only see this indication when the
receiver is in Search The Sky mode (cold start condition). This
usually indicates that an almanac is not present. If you let the
receiver run for 30 minutes with the antenna connected and in a
suitable location, the almanac will be updated, and one of the
known conditions above will replace the asterisk (*).
If for some reason you have forced a satellite healthy or unhealthy,
you can set it back to its natural reported state (from the DoD) by
pressing the Set Natural softkey.
6 Channel Screen
The bottom window provides some basic satellite tracking perfor-
mance information. The HDOP and VDOP values indicate the
current Horizontal or Vertical Dilution Of Precision as described in
108
12 Channel Screen
Version 3.3
GPS