ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 35
Issue: 1.2.4
SCTM2-OPS
Operations Manual
standards. It can receive and process string groups at a maximum of 10 Hz. Below is a list of the strings
accepted and their data they contain:
·
RMC – Latitude, Longitude, SOG, and COG
·
GGA – Latitude, Longitude
·
HDT - Heading
·
VTG – SOG and COG
·
DPT – Water Depth
·
DPT (Marine Sonic Altitude) –Water Depth and Altitude
·
ZDA – Time
·
AUV – Time, Latitude, Longitude, SOG, COG, Water Depth, Altitude, Roll, and Pitch, Speed Of Sound
·
SYNC - Time
While the sonar system will accept all of the above strings, we recommend that they be used in certain
combinations to avoid duplication of data. The sonar system at a bare minimum requires that Latitude,
Longitude, SOG, and COG be provided. While it is not necessary for these data to be provided, it is
essential that they are provided for the best results. In addition to the navigation data, water depth and
altitude can also be added. Since many of the above strings contain the same data, MST recommends that
only certain combinations of strings be used to avoid unnecessary processing of data. These combinations
are:
·
RMC
·
AUV
·
GGA and VTG
·
GLL and VTG
In addition to the above navigation data string combinations one of the sentences containing water depth
and or altitude is desirable. As with the navigation data strings it is recommended that only 1 string with
each data type be sent. Only 1 of the following strings should be used at a time, DPT (NMEA standard
version), DPT (MST version), and AUV. The DPT (MST version) and the AUV string are the only strings that
contain altitude and depth. The NMEA standard version of DPT only contains water depth. Please note that
in order to use the DPT string as depth only the DPT identifier must be prefixed with "MS" instead of "GP".
This identifies the string as a Marine Sonic proprietary string. This can be accomplished using the
configuration facilities of the system and is explained in greater detail later in this document.
The RMC, ZDA, AUV, and SYNC sentences are unlike the other strings in that they provide the ability to
synchronize time. The sonar system will synchronize its time with the ZDA or PAUV sentence when it is
received. This allows many sensors (the sonar system being one of them) to synchronize the time stamps
with a common time base.
6.3.1
Standard NMEA Data Strings
This section details the NMEA 0183 standard data strings that we accept. All standard strings should be
prefixed by "GP".
