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Old 17-12-2012, 13:05   #16
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Re: Position of Heading Sensor?

Dockhead:

The sat compass has impressive performance, but it's a pretty large unit AND it requires an unobstructed view of the sky. I think it's > 2' long - I can't imagine putting that above the masthead light.

We went w/the H2183 in addition to our PB200. The H2183 is mounted in the salon, under the table apron.
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Old 17-12-2012, 13:25   #17
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Re: Position of Heading Sensor?

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Dockhead:

The sat compass has impressive performance, but it's a pretty large unit AND it requires an unobstructed view of the sky. I think it's > 2' long - I can't imagine putting that above the masthead light.

We went w/the H2183 in addition to our PB200. The H2183 is mounted in the salon, under the table apron.
Ah, well, a sat compass doesn't need to be at the masthead, on the contrary, that's a bad place for it. I would mount it on the rail.

How is the H2183 working for you? MARPA? Autopilot?
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Old 17-12-2012, 13:38   #18
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Re: Position of Heading Sensor?

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Ah, well, a sat compass doesn't need to be at the masthead, on the contrary, that's a bad place for it. I would mount it on the rail.

How is the H2183 working for you? MARPA? Autopilot?
Yes, agreed - atop the mast would be bad - I think this unit is designed for power boats / larger vessels. Just not sure you would get performance from one mounted on the rail since there would be too many obstructions / reflections. I am only familiar w/the Furuno unit, as I went thru a process like your current one, trying to design a new system. As I recall Furuno is very specific about their unit needing to be mounted above everything else, away from radar etc.

H2183 is working well with our Simrad AP setup.
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Old 17-12-2012, 13:58   #19
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I can provide some real feedback from my experiences of the HemisphereGPS Vector OEM unit using two standard GPS active antenna mushrooms. I have no direct experience of other units.

View of the sky is not a big issue , no more then any GPS unit. The HemisphereGPS unit has an integrated flux gate plus accelerometer which provides heading if you loose lock. In practice you don't and mine was stern rail mounted. Placed on a radar can or similar construction above the Bimini etc would be fine. ( beside your antenna farm ) , my mates used to slag me that my boat actually was really a Russian spy trawler with sails !!!

Separation distance , ie between the two antennas has a major impact on accuracy, processor performance and first fix time to solution. Further apart requires much more tuning and in certain circumstances can lead to long ( > several minutes) time to first solution. This is why most commercial units use about .3-.4 metre separation. ( I trialled up to 0.8 )

Really sat compasses are the best heading units you can buy. Until you used them, you'd never go back to flux gate units. The main reason you haven't seen them on small yachts is purely price. But I expect with the increasing penetration of overlay radar, MARPA , AIS overlays and the reliance on good auto pilots, well see much more of these.

You are right Dockhead they are capable of incredible position accuracy , well beyond what's useful on a boat.

Yes we are only scratching the surface of GNSS systems. When we have 2-4 competing system and we can aggregate between them..........!!!!

If you can get one for 2k , run out and buy it. Certainly better then wasting money on so called high performance flux gate units.

Dave
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Old 17-12-2012, 14:13   #20
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Re: Position of Heading Sensor?

Dockhead, please stop posting about Electronics. I keep learning stuff and that inevitably leads to wanting stuff and yer costing me money dangnabbit!
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Old 17-12-2012, 14:23   #21
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Re: Position of Heading Sensor?

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Dockhead, please stop posting about Electronics. I keep learning stuff and that inevitably leads to wanting stuff and yer costing me money dangnabbit!
Heh, heh!

Just wait till I post photos of my newly installed system . . .
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Old 17-12-2012, 17:46   #22
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Re: Position of Heading Sensor?

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Why what do you know ?

Dave
No. Just the general rule with all electronics. Remember early GPS prices?

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Old 17-12-2012, 17:48   #23
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Re: Position of Heading Sensor?

Then again why not build something that locks on direction once and then re-adjusts from accelerometers?

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Old 17-12-2012, 17:52   #24
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Quote:
Originally Posted by barnakiel
Then again why not build something that locks on direction once and then re-adjusts from accelerometers?

b.
Why bother , when phase relationship give up constant reliable updates. That are not affected by extraneous movement , accelerometers are always a compromise.

Dave

Ps GPS satellite compasses are getting cheaper , mind you the rate isnt fast because the applications are still fairly specialised , it will come no doubt
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Old 17-12-2012, 18:37   #25
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Re: Position of Heading Sensor?

Here is a pic I found of the Furuno SC-30 mounted above the radome:

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Old 17-12-2012, 19:51   #26
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Re: Position of Heading Sensor?

These are not new. They have been around for quite a long time, its just that they had very high prices 10 or 15 yrs. ago. Probably 5 yrs. ago as well.

Dh, they might not work on your boat as they are only good for 999 knots

Hey, I am learning a lot from your questions and system design work.
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Old 15-01-2013, 11:02   #27
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Re: Position of Heading Sensor?

Contacted "Canal Geomatics", I am waiting for a call back and will let everyone know the prices they quoted me .

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Old 15-01-2013, 12:45   #28
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Re: Position of Heading Sensor?

I was quoted $ 2345.00 for the Hemisphere GPS Vector 102 and $3000 for the Hemisphere GPS Vector 103 .

This is in Canadian Dollars , of course plus taxes and shipping. Still a little pricey , maybe in a couple of years it will be better when this technology becomes more mainstream.

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