Leica MX400 Operating Instructions Manual page 158

Configuration
than these minimum number of satellites to provide a
position fix, based on their geometric relationship to your
actual position. The HDOP and VDOP values described in
the GPS section of this manual will give you a good clue as
to the satellite geometry. Auto 2D/3D is the default setting.
3D Only: This selection causes the receiver to provide a position
fix only when the HDOP and VDOP values or the number
of satellites allows a 3 dimensional position to be calcu-
lated.
2D: This selection causes the receiver to provide a position fix
only when the HDOP value or the number of satellites
allows a 2 dimensional position to be calculated. The
antenna height you entered is used for the vertical portion of
your position fix
Antenna Height Unit:
This selection determines the unit of measure for the antenna
height calculation. Available choices are either Meters (default)
or Feet.
Antenna Height:
This is the antenna height above Mean Sea Level (MSL) that
you enter for 2D mode positioning, 5.0 meters is the default
value. To achieve maximum position accuracy, it is important to
enter an accurate value. Any error you input in this value will
directly impact your position accuracy when operating in 2D
mode. You can verify your current positioning mode and
altitude in the POS POS2 and POS3 screens.
Reference System:
This setting controls the coordinate system used to display your
position. The available choices are Lat/Lon (default), UTM
(Universal Transverse Mercator), Decca, or Loran C. The
receiver will automatically convert any waypoint in the Route
Bank or Waypoint Bank when a different coordinate system is
entered. Note that when you select a coordinate system other
than Lat/Lon, data in the NMEA 0183 records will remain in the
Lat/Lon format, as defined in the NMEA 0183 standard.
When you select UTM, you can set the Zone yourself (Man), or
Version 3.3
Operator's Manual
145