For 12 Channel Gps Models - Leica MX400 Operating Instructions Manual

GPS
discretion of the US Department of Defense.
The receiver must have the satellite almanac to
determine the number of visible satellites, and
their azimuth and elevation relative to your
present position.
The Elevation Mask sets the lowest elevation at
which a satellite will be tracked. Satellites with
an elevation below this number will not be
tracked, even if they are otherwise available to track. You can set
the elevation limit to any value up to 45° in the CFG1 GPS screen.
For most marine applications, the default limit of 5° is appropriate.
However, some applications may require a higher elevation limit.
Although not a marine environment, an example would be trying to
get the best possible position from the receiver in an environment
which has significant foliage causing low elevation satellites to
"pop in and out". You might choose to set the elevation limit to 15°
so that only satellites above the tree line are tracked.
The graphic on the right hand side of the screen indicates where the
satellites are relative to your present position. The outer ring
represents 0° elevation. The inner ring represents 45° elevation. The
+ sign represents 90° elevation and your present position. Under
normal conditions, the best satellites to track are usually between
15° and 75° in elevation.

For 12 Channel GPS Models

There are two windows in this display. The left window has twelve
graphic Power Bars representing the twelve GPS receiver channels
of the receiver. The PRN (PseudoRandom Number) under each
power bar represents the satellite ID number assigned or being
tracked on that channel. The power bars indicate the valid receiver
power range from 30 to 50. Any portion of the power bar which is
filled in, indicates that a satellite is being tracked on that channel. If
a power bar is empty, but a PRN number is labeled under the power
bar, then the identified satellite is not currently being tracked.
Version 3.3
Operator's Manual
105