Installation manual

Technical specifications
173
851-164510 / Rev.E
Trawl systems
The SP90 interfaces a trawl system via Ethernet or on a serial
line. The serial interface uses either the NMEA 0183 standard,
or Simrad’s version of it. In the Simrad version of NMEA
telegrams, the Start Of Sentence delimiter $ is replaced with @.
The following trawl systems are interfaced: ITI, FS900 and
FS3300.
Note: Other telegrams than trawl may be received from the ITI, since
this system may be used as a telegram router.
ITI Inputs
The SP90 can receive the following trawl telegrams from the
ITI system.
• Trawl position true vessel
• Trawl position in cartesian co-ordinates
• Trawl position in latitude and longitude
• Depth of trawl below surface
• Water temperature at the trawl
• Trawl headrope to footrope and bottom
• Trawl door spread
• Trawl spread 2
• Trawl filling
• Trawl to shoal distance
• Heading, magnetic
• Heading, true
Trawl position true vessel
@IITPT,x,M,y,P,z.z,M<cr><lf>
where (from left towards right):
Component Content
TPT True trawl position relative to the vessel
x,M Horizontal range to the target
y,P Ttrue bearing to the target
z.z,M Depth of trawl below the surface