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post #1 of 3 Old 10-07-2007 Thread Starter
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Simrad CA40?

A boat we just looked at has a full Simrad setup - a CA40 down below and a DS40 repeater up top. I'm familiar with our Raymarine C-series units. How does the Simrad unit compare? It also has an AP20 and AP22 Simrad/Roberson autopilot, an RFC35 rategyro sensor for the autopilot, both a Robertson hydraulic linear drive and an Whitlock electric drive, Simrad IS15 nav, electronic speed, wind, depth and close-hauled display and an Simrad Anritsu radar system with a 36" open array w/48 mile range and color display.

Does anyone know whether this system would support MARPA, AIS and radar overlay?

s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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post #2 of 3 Old 10-08-2007
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Unless I'm missing something, you don't say what charting / EN software you're using. This seems to be a top of the line installation and tightly integrated, so the answer to the software / firmware question is important. MARPA is largely a radar issue...YOUR radar, not the target's and, unlike AIS, the number crunching horsepower necessary to develop and display that target's dynamics (speed, direction, CPA, TCPA, etc) is a function of your system, primarily your radar and it's display. There should be a card or slot available in the unit to take care of that function alone and plenty of documentation to support it. The short of this answer is, look for evidence, printed or otherwise, that your radar either has MARPA capability already or can get it. The Europeans are way, way ahead of us in ARPA and AIS technologies anyway, and I'd be surprised if your system can't put these two issues together.
You'll discover soon enough that AIS is the cat's meow when it comes to figuring out if other vessels pose a threat to you...much more information is provided to you than you can get from MARPA. The big difference is that MARPA data are derived, relative to you; AIS positional data are absolute, that is, developed from GPS coordinates and transmitted to you constantly along with much other descriptive information pertaining to the vessel. What your software has to do is take all the available positional possibilities and put everything neatly on your display. From this answer, you might conclude, correctly, that the value of MARPA is vastly reduced if you have AIS, and I'd bet that your system can integrate AIS right now on your radar display...but you may need to upgrade your charting software or firmware.
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post #3 of 3 Old 10-08-2007 Thread Starter
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The Simrad's use the cMap chips I believe. After talking to a few people, it appears as if the Simrad units are very difficult to use and aren't as feature rich as a Raymarine or Garmin. They are mostly found in commercial vessels. I understand AIS and MARPA - just not sure what the capabilities of this particular unit are. Thanks for the feedback though!

s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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