40
NORTEK
7.1.2 $SDGGA - Global Positioning System Fix Data
Field
Description
DataFormat
Time
HHmmss.ss
Latitude
Geographical Latitude
dddd.dd
N or S
The letter ‘N’ or ‘S’ for North or South
Longitude
Geographical Longitude
ddddd.dd
E or W
The letter ‘E’ or ‘W’ for East or West
Quality
GPS Quality Indicator
N
Nr Of Satellites
Number of satellites in view, 00 - 12
NN
HDOP
Horizontal Dilution of precision (meters)
dd.d
Altitude
Antenna Altitude above/below mean-sea-level (geoid) (in
meters)
dd.dd
M
Units of antenna altitude, Meters
Separation
Geoidal separation, the difference between the WGS-84 earth
ellipsoid and mean-sea-level (geoid), "-" means mean-sea-level
below ellipsoid
dd.dd
M
Units of separation, Meters
ddd.ddd
Differential Age
Age of differential GPS data, time in seconds since last SC104
type 1 or 9 update, null field when DGPS is not used
N
Reference Station
Differential reference station ID, 0000-1023
NNNN
Example:
$SDGGA,121816.244,5134.6213945,N,00405.4297275,E,0,00,0.0,-10.0,M,0.0,M,,*7A
7.1.3 $SDVTG - Track made good and Ground speed
Field
Description
DataFormat
Track Degrees
Heading in degrees North
ddd.dd
T
The letter ‘T’ for True North
Track Degrees
Heading, magnetic north
ddd.dd
M
The letter ‘M’ for Magnetic North
Speed Knots
Speed over ground in Knots
dd.dd
N
The letter ‘N’ for knots
Speed km/h
Speed over ground in km/h
dd.dd
Example:
$SDVTG,0.00,T,,M,1.85,N,3.60,K*59
The following messages are a subset of the messages as used by the Nortek DVL (Doppler Velocity Log),
but the ‘Tagged NMEA’ versions are not supported (e.g.
$PNORS2,DATE=083013,TIME=132455,EC=0, SC-
34000034…)
7.1.4 $PNORI1
– General Information
Field
Description
DataFormat
Instrument Type
N
Head Id
Serial number of instrument
N
Number of Beams
N
Number of Cells
Number of valid cells
N
Blanking Distance
[m]
dd.dd
Cell Size
[m]
dd.dd
Coordinate System
Always E(ast) N(orth) U(p) for
Signature VM
ENU
Example:
