ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 40
Issue: 1.2.4
SCTM2-OPS
Operations Manual
Name
Example
Units
Description
42
2 Digit Hexadecimal
Sentence Terminator
<CR><LF>
Indicates end of sentence.
6.3.2
Proprietary NMEA Data Strings
This section details the NMEA 0183 formatted proprietary data strings that we accept. All Marine Sonic
proprietary strings are prefixed by "MS".
6.3.2.1
DPT
The DPT string is a NMEA 0183 V1.5 standard string that has been adapted to provide more information. The
DPT string normally contains Water Depth and Transducer Offset from the surface. The MST interpretation
rearranges the meaning of these values in order to obtain altitude data. Currently there are no standard
NEMA 0183 strings that convey altitude data. When sending the MST DPT string the Transducer offset is
interpreted as the Water Depth (distance from the surface to the sonar) and the Water Depth now becomes
the Altitude (distance from the sonar to the sea floor). Adding the values together will result in Total
Water Depth (distance from the surface to the sea floor). Below is an example of this string:
Example:
$MSDPT,<altitude>,<depth>,<max. range scale>* hh<CR><LF>
Format Description:
Name
Example
Units
Description
Start Of String
$
$ indicates start of string
Message ID
MSDPT
Marine Sonic DPT string
identifier
Altitude
<altitude>
meters
Altitude of the sonar
(Distance from the sea floor
to the sonar).
Depth
<depth>
meters
Depth of the sonar (Distance
from the surface to the
sonar).
Max. Range Scale In Use
Not used.
Checksum Delimeter
*
The checksum comes after
this character.
hh
2 Digit Hexadecimal
Checksum of the entire string.
Sentence Terminator
<CR><LF>
Indicates end of sentence.
6.3.2.2
AUV
The proprietary AUV string is constructed to include time synchronization, Latitude, Longitude, SOG, COG,
Heading, Water Depth, Altitude, Roll and Pitch. It provides the ability to combine all of the data provided
by the standard NMEA 0183 V1.5 strings as well as additional data into 1 single string. The AUV string is
formatted in the following manner:
Example:
