Seatex DPS 200 Installation Manual, rev. 4 Installation
35
VTG Message
The VTG message contains actual course and speed relative to the ground. The message is as
specified in NMEA 0183 versions 2.2, 2.3 and 3.0. The message structure is as follows:
$GPVTG,ttt.tt,T,ttt.tt,M,ggg.gg,N,ggg.gg,K*cc
Table 22 describes the VTG message fields.
Field Description
ttt.tt True course over ground in degrees.
T True course over ground marker.
ttt.tt Magnetic course over ground in degrees.
M Magnetic course over ground marker.
ggg.gg Speed over ground in knots.
N "N" shows that speed over ground is in knots.
ggg.gg Speed over ground in kilometres/hour.
K "K" shows that speed over ground is in kilometres/hour.
*cc Checksum.
Table 22 VTG message fields
Westerstrand Messages
The Westerstrand messages, WSTRAND and WSTRAND_Y2K, are time telegrams, which
provide local time for the Norwegian North Sea. The time indicated by these telegrams is the
UTC received from the GPS receiver, adjusted with the proper time zone and daylight saving
time. Daylight saving changes are automatically detected according to Table 23. The messages
are output once per minute at second = 0 on binary format.
The difference between the WSTRAND message and the WSTRAND_Y2K message, is the
output of the year field. While WSTRAND outputs e.g. year 2002 as 102, WSTRAND_Y2K
outputs year 2002 as 2.
The WSTRAND message is compatible with DARPS 12.
Time Period Add to UTC
Winter Last Sunday in October UTC 01:00 to last Sunday in Marc UTC 00:59 1 hour
Summer Last Sunday in March UTC 01:00 to last Sunday in October UTC 00:59 2 hours
Table 23 Change between summer and winter time in Westerstrand message
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