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Old 29-01-2015, 09:20   #31
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Re: Satellite Compasses?

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Originally Posted by goboatingnow View Post
No the board comes ready to go, its basically encasing it , you can use two conventional GPS antennas ( 5V DC, active but not with integrated GPS obviously ) as the antennas, mounted accurately on a linear horizontal mount.

The dealer for Hemishpere was on the Isle of Man, I brought originally through a dealer in Azriona , its a few years back, I still have the original Vector OEM unit ( 0183 only )
Cool! Then why not?! I'll keep my H2183 hooked up, so I can afford to experiment. Just $1000 for centimeter precision??

So I guess I just need to buy a case and arrange some connections. Probably also a power supply? I presume that it outputs 0183 sentences? Probably over RS422? I could probably hook it straight up to one of those Actisense converters.

Antennae installed on a nice massive alu bar for perfect alignment. If they only need a meter of separation, I can install them inside my scuttle instrument enclosure.

Now this sounds like fun -- and don't think I'll even need my IT guys.
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Old 29-01-2015, 09:25   #32
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Re: Satellite Compasses?

Are the dots you are getting all at the same range but spread across a number of degrees?
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Old 29-01-2015, 09:29   #33
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Re: Satellite Compasses?

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Originally Posted by Dockhead View Post
Cool! Then why not?! I'll keep my H2183 hooked up, so I can afford to experiment. Just $1000 for centimeter precision??

So I guess I just need to buy a case and arrange some connections. Probably also a power supply? I presume that it outputs 0183 sentences? Probably over RS422? I could probably hook it straight up to one of those Actisense converters.

Antennae installed on a nice massive alu bar for perfect alignment. If they only need a meter of separation, I can install them inside my scuttle instrument enclosure.

Now this sounds like fun -- and don't think I'll even need my IT guys.
yeah try the H320 for a real blast

they are all serial port ( 3v3 TTL so needs a convertor) and 3v3 power supply.
I see they are still 0183 output, but so what. you don't need roll info anyway


They do a development system with PSU box etc for the Cresent H200 I believe
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Old 29-01-2015, 09:32   #34
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Re: Satellite Compasses?

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Originally Posted by goboatingnow View Post
yeah try the H320 for a real blast

they are all serial port ( 3v3 TTL so needs a convertor) and 3v3 power supply.
I see they are still 0183 output, but so what. you don't need roll info anyway
Actually I would like roll and pitch. When sailing hard I like to set one cockpit display to show heel. Any way to get that onto the system somehow?
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Old 29-01-2015, 09:33   #35
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Re: Satellite Compasses?

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How do you know it works fantastic ?

Have you a way of independently confirming vector information , say by AIS or something else.

its often very hard to know, if the info coming back is meaningful
On occasion I compare what I am seeing visually, to what AIS is telling me to what the ARPA system is telling me.
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Old 29-01-2015, 09:46   #36
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Re: Satellite Compasses?

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Actually I would like roll and pitch. When sailing hard I like to set one cockpit display to show heel. Any way to get that onto the system somehow?

The vector systems output a $ROLL and $YAW 0183, the format is all set out in their comphrensive guides to the board. Don't know if your simrad can handle that.
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Old 29-01-2015, 09:53   #37
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Re: Satellite Compasses?

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Originally Posted by goboatingnow View Post
The vector systems output a $ROLL and $YAW 0183, the format is all set out in their comphrensive guides to the board. Don't know if your simrad can handle that.
Won't matter as long as I can find an N2K converter which can handle those sentences.

Or I could just continue taking that data from the H2183. Which then would become an awfully expensive heel sensor
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Old 29-01-2015, 10:02   #38
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Re: Satellite Compasses?

NKE has a GPS compass as well. You should look at it, as it use separate antennas that you can put as far away from each other as your boat allows.


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Old 29-01-2015, 10:02   #39
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Re: Satellite Compasses?

There have been very good differential GPS systems used in motorsport and auto dynamics testing for years. They would easily meet your spec. Roll, yaw, pitch and the 3 translations at very high res.

Pi Research is the most common and very rugged. They do provide specialist consulting and bespoke sailboat systems. You'll need to remortgage your house though.

Not sure why you would need that sort of response and resolution on a sailboat though.

For an off the shelf solution B&G would probably fit your needs.

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Old 29-01-2015, 10:16   #40
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Re: Satellite Compasses?

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I totally agree if the range of the contact and your boats heading is bouncing around that you are going to get less accurate RML of the contact.

I know my fluxgate has some sort of averaging for "smoothness" as Furuno calls it. I do not know exactly how the averaging is done. It's a Furuno PG500R.
The PG5000 is a solid state gyro. My marpa displays using it are very stable too.
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Old 29-01-2015, 10:29   #41
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Re: Satellite Compasses?

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Originally Posted by leftbrainstuff View Post
There have been very good differential GPS systems used in motorsport and auto dynamics testing for years. They would easily meet your spec. Roll, yaw, pitch and the 3 translations at very high res.

Pi Research is the most common and very rugged. They do provide specialist consulting and bespoke sailboat systems. You'll need to remortgage your house though.

Not sure why you would need that sort of response and resolution on a sailboat though.

For an off the shelf solution B&G would probably fit your needs.

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Navico (B&G et al) do not make a competitive heading sensor.

For why you need accurate heading data on a sailboat, see the post #22 above Satellite Compasses?
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Old 29-01-2015, 10:41   #42
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Re: Satellite Compasses?

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The PG5000 is a solid state gyro. My marpa displays using it are very stable too.
The PG500R is the same technology as the H2183, with similar specs, but the H2183 is supposed to be better, because of three-axis stabilization.


Panbo: The Marine Electronics Hub: Airmar H2183 compass, best in class?
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Old 29-01-2015, 10:59   #43
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Re: Satellite Compasses?

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The PG500R is the same technology as the H2183, with similar specs, but the H2183 is supposed to be better, because of three-axis stabilization.


Panbo: The Marine Electronics Hub: Airmar H2183 compass, best in class?
Which makes me wonder why your system seems to have marginal marpa capability.
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Old 29-01-2015, 11:03   #44
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Re: Satellite Compasses?

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Which makes me wonder why your system seems to have marginal marpa capability.
I have never been on a recreational boat, even some very large expensive ones, where MARPA worked very well, or any better than mine does.
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Old 29-01-2015, 11:23   #45
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Re: Satellite Compasses?

Maybe its in the eye of the beholder. If I see a target that doesn't have AIS and I want to understand what his course and speed is, I select the target and wait for it to acquire. Then I use the info. That works for me fine.
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