Hemisphere GPS MBX-4, Руководство пользователя

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MBX-4 User Guide
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Hgt
Displays the current height in either meters or feet depending on the
units selected, as input from an external GPS receiver (See Chapter 4).
This information is parsed from the NMEA $GPGGA message string.
Hdg
Displays the horizontal heading clockwise from True North in degrees.
This information is parsed from the NMEA $GPVTG message string.
Vel
Displays the horizontal speed in KPH, MPS, or knots depending on the
units selected, as input from an external GPS receiver (See Chapter 4).
This information is parsed from the NMEA $GPVTG message string.
UTC
Displays the current UTC Time with local offset as input from an
external GPS receiver (See Chapter 4). This information is parsed from
the NMEA $GPZDA message string.
Age
Displays the current DGPS age of correction in seconds, as input from
an external GPS receiver. This information is parsed from the NMEA
$GPGGA message string.
SV Count
Displays the current number of satellites being used by the GPS
receiver in computing its position. If this value is 4 or greater, then the
computed position is 3D, and includes a valid height solution. If less
than four, then the solution is 2D, holding the height parameter
constant at either 0, or its last measured value.