ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 50
Issue: 1.2.4
SCTM2-OPS
Operations Manual
Element
Variable Type
Description
fHeave
float
Heave in centimeters.
7.1.3.5
Fathometer Data Packet
The fathometer data packet stores depth and altitude information for a particular origin. This data can be
used along with the navigation data to give the user an accurate geographical location. The fathometer
data payload is described below. Any invalid or unknown values should be set to 99999.99. This insures
that a program reading the SDS will know that the value is invalid and should not be used.
Element
Variable Type
Description
wSource
WORD
This is the origin of the fathometer data.
The Scout MkII sets this to
DATASOURCE_SONAR.
fDepth
float
This is the depth in meters.
fAltitude
float
This is the altitude in meters.
7.1.3.6
NMEA Data Packet
The NMEA data packet stores a NMEA string, the length of the string (including the NULL terminator), and
the origin of the string. The NMEA data packet starts with a NMEA data packet structure followed by the
actual NMEA string itself. These strings can be used to transport unprocessed strings over a data link for
processing by the receiver. The NMEA data packets also can be used to store processed strings that can be
used for reprocessing or to look at the original strings that were the source of the processed data.
Element
Variable Type
Description
wSource
WORD
This variable stores the source location
of the NMEA data. The Scout MkII sets
this to DATASOURCE_SONAR.
wLength
WORD
Length of the string in the characters
including the NULL terminator.
Pictured below is a diagram showing how data is stored in a NMEA data packet.
