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Old 09 October 2015, 07:18   #1
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NMEA GPS Antenna

Just bought a DSC Standard Horizon fixed vhf.
I want to rig it up so that it I'd GPS enabled.
Apparently I need a NMEA GPS Antenna.
Had a quick look online and some are more expensive than the VHF.
Cheapest I've seen is 60 quid.
Does anyone know of a cheaper effective product.
I use a Hudl tablet in a waterproof case running Marine Maps MX Mariner for coastal navigation.
I don't think there is any means of taking a GPS from the tablet?
Thanks in advance.
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Old 09 October 2015, 07:49   #2
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To be fair, I've had experience of the Hudl from family members & up to now they've been rubbish. The point of DSC is that in a "shit or bust" situation, it hopefully calls the cavalry. You wouldn't be wanting to rely on a Hudl in that situation. A bit late now, but the SH GX1700 has built in GPS. If you can get a "proper" marinised GPS antenna for 60 quid, it's a no-brainer (IMHO of course) The other alternative is a handheld Garmin (second hand?) GPS, most of these will output nmea0183 & you have the benefit of a rudimentary navigation aid into the bargain. Even then, the plug for the nmea output on the Garmins isn't usually waterproof.
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Old 09 October 2015, 10:57   #3
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Thanks again P.D.
I am not at all clued up on this subject.
If i can get a decent Antenna for around 60 quid I'd be happy to pay that for peace of mind.
I'm on a tight budget as major home renovations bleeding me dry!
Waterproof is definitely the way to go.
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Old 09 October 2015, 14:28   #4
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Snag with the marinised 'antenna' is its quite big for a SIB?

Alternative option would be a basic "mouse" version with an RS-232 port type connection. Most these days are 5V so you'd need a 12V to 5V convertor (ALA USB power supply) - put all in a waterproof enclosure or even set inside a small amount of epoxy resin? It'll be cheaper (Circuit c10 on ebay, power c5), but you wont have anyone to come back to when it fails.. and if it fails at the wrong moment you might have no-means to come back...
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Old 09 October 2015, 14:30   #5
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I use one of the "Evermore" after-market units. Seems to work well and worked straight out of the box.
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Old 09 October 2015, 14:35   #6
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Are you talking about an antenna using NMEA2000 or NMEA0183?

Most NMEA2000 antennae seem to run in the $200 an up range (US dollars.) You will likely need additional stuff to get the NMEA200 backbone operational, so figure that in as well.

You can get some antennae that talk NMEA0183, but they tend to be fairly generic in setup, so you'll have to pick and choose the appropriate accessories to plumb it in to your setup. They are fairly inexpensive (under $50US - google "NMEA 0183 GPS antenna")

IMO, it may be easier to buy an inexpensive chartplotter that will output NMEA0183 and use that instead of a dedicated antenna. Usually 2 or 3 wire connections to get that connected. Plus, you end up with a chartplotter.

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Old 09 October 2015, 17:02   #7
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Quote:
Originally Posted by jyasaki View Post
Are you talking about an antenna using NMEA2000 or NMEA0183?

Most NMEA2000 antennae seem to run in the $200 an up range (US dollars.) You will likely need additional stuff to get the NMEA200 backbone operational, so figure that in as well.
This is for a SIB. He definitely doesn't want to be going NMEA2k.
He just needs an NMEA 0183 feed.
Quote:
You can get some antennae that talk NMEA0183, but they tend to be fairly generic in setup, so you'll have to pick and choose the appropriate accessories to plumb it in to your setup. They are fairly inexpensive (under $50US - google "NMEA 0183 GPS antenna")
Not seeing any hits in that price range that are the 'traditional' mushroom thing. A GPS mouse would work fine but wont be waterproof. In a RIB thats fine - keep the mouse in the console. In a SIB there is no-where genuinely dry...

Quote:
IMO, it may be easier to buy an inexpensive chartplotter that will output NMEA0183 and use that instead of a dedicated antenna. Usually 2 or 3 wire connections to get that connected. Plus, you end up with a chartplotter.
Snag is he's got limited power supply IIRC. A plotter will draw maybe 1A/hr a GPS will draw maybe 15mA/h
Wiring connections will be no harder than wiring in a plotter for power and NMEA...
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Old 09 October 2015, 18:24   #8
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I think the answer is change the radio for a one with built in gps positioning that way it's all in one box & designed for the purpose
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Old 09 October 2015, 18:56   #9
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Quote:
Originally Posted by ShinyShoe View Post
Snag with the marinised 'antenna' is its quite big for a SIB?

...

No it's not, unless you think 3" is big😎


.....sh1t happens.......
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Old 09 October 2015, 19:02   #10
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I have a waterproof compartment I could place a non waterproof mouse type GPS in - providing it still works whilst inside?
I like the sound of this idea.
I'm not into changing the VHF unit for one with integrated GPS .
It is for a 3.5m Sib so being compact would be a bonus.
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