ATLAS North America Proprietary
Sea Scan ARC Scout MKII Operations Manual
1 of 1
Page: 38
Issue: 1.2.4
SCTM2-OPS
Operations Manual
Name
Example
Units
Description
Start Of String
$
$ indicates start of string
Message ID
GPHDT
HDT string identifier
True Course
132.8
degrees
Measured heading
Reference
T
True
Checksum Delimeter
*
The checksum comes after
this character.
3D
2 Digit Hexadecimal
Sentence Terminator
<CR><LF>
Indicates end of sentence.
6.3.1.4
VTG
This string contains Course Over Ground and Speed Over Ground.
Example:
$GPVTG,309.62,T, ,M,0.13,N,0.2,K,A*23
Format Description:
Name
Example
Units
Description
Start Of String
$
$ indicates start of string
Message ID
GPVTG
VTG string identifier
True Course
309.62
degrees
Measured heading
Reference
T
True
Magnetic Course
degrees
Reference
M
Magnetic
Speed
0.13
Knots
Measured horizontal speed
over ground.
Units
N
Knots
Speed
0.2
km/hr
Measured horizontal speed
over ground.
Units
K
Kilometers per hour
Mode
A
A = Autonomous, D = DGPS, E
= Dead Reckoning
Checksum Delimeter
*
The checksum comes after
this character.
23
2 Digit Hexadecimal
Sentence Terminator
<CR><LF>
Indicates end of sentence.