Raymarine fluxgate

ccscott49

ccscott49

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Does anybody know if the fluxgate, supplied with the ST50 compass and other autopilots, outputs NMEA data, or is that done by the ST50 head? I need NMEA compass data for a navitron autopilot.
I see NASA do a fluxgate with NMEA out[put, I may have to go for one of those.
Thanks.
 
Please check for me, if its suitable, great, if the NASA one is suitable, I may have to buy it or this autonnic one.

Your pc autopilot project thingy isnt working. would like to know about it, thanks.
 
Hi,

the autopliot wiki is down at the moment, one of the forum members on here NimbusGb hosts the wiki and is looking into the problem. Hopefully the wiki should be up soon. in the meantime there is a social group on the forum that was in use prior to the wiki where ideas were thrown around, it may be a good starting point. There is also a link in the social group to the sourceforge where the first implementation of a heading controller can be found, it does'nt interface with anything but it does show the algorithm that controls the rate of turn and the smoothing applied
 
I Just realised that i had a ST50 compass knocking about in the shed. i have just tried it and it appears that it uses Sin values. It would need a NMEA subsytem to output NMEA, this must be on the board for raymairine AP's

any further details on the ICOM. I have no direct experiance of the NASA, but their products do seem to do what they say on the tin. The autonnic one is good and can be calibrated quite well. What sort of scenario are you planning to use the compass for?, there may be some alternative routes. I am guessing you don't have a AP at the moment or you would use the NMEA out from it to get the HDG NMEA sentence
 
I am considering purchase of a Navitronic 921 mk2 auto pilot, the supplied sensor, requires an externally gimballed compass to fit the sensor coil to, I dont have that. So they say I can have two inputs, one form the GPS and one from a fluxgate compass, but it must have NMEA output to be of use to the autopilot. That's as far as I've got so far, my old Sharp oceanpilot has gone belly up! I'm sure it could be repaired, but its 35 years old now! and a museum piece. Maybe time I had a new one.
 
I see, i remember reading your thread, i am not bad at discreete components but have not diagnosed for years.

I would ask navitronics what Hz NMEA compass is acceptable. The large majority of consumer parts are 1hz, i.e 1 heading update per second, although Simrad/B&G do make a 5hz version. It woudl be best to check with Navitronics first and then the manafacturers. If you can get away with a 1hz compass then the NASA or the Autonnic would do the job well as they both have NMA subsystems on board ( the NASA seems very keenly priced, although i cannot find a reference to their output speed.

It would also be worth checking what NMEA sentences the Navitronics accepts for hading data, and vice versa what sentences the Compass provides. there are a couple of different sentences and the may not be compatible.

if the NASA has suitable sentences then price wise it seems like a good deal. If you need more info then give me a shout

Cheers

ShaunG
 
They are talking heading data at 10hz. They reccomended KVH and furuno, both are excessively priced! Might be better to get an externally gimballed compass, as they supply a heading sensor coil for those, in the standard package.
The sentences it accepts are NMEA 0183, xxhdt, hcc, hdg, hdm.
 
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