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Old 10 October 2015, 03:47   #11
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No it's not, unless you think 3" is big😎
I've heard once or twice its not the size but what you do with it ;-)
You are right 3inch is not big - but where do you put that 3" on a SIB. No A frame, No console, it wants to point to sky...
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Old 10 October 2015, 04:31   #12
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So as a suggestion you'd want something like this:

GPS08-15U PS2 Connector Mini size Waterproof GPS Mouse (U-Blox 6 UBX-G6010-ST) | eBay it claims to be waterproof (might not be IPx7 but you know keeping anything 100% dry on a SIB is a challenge so even in a water proof compartment this may be better!) Its more expensive than some others - but some of the others I quickly looked at were wrong baud rate I think. (Not sure which SH Radio you have but I think SH like 4800 baud with GLL, RMB, GGA, GNS sentences.) This one defaults to 4800 and GGA is in its list. GGA contains time of fix, position and some quality info about the fix. All you need!
GLL and GNS are essentially the same info in a different format. RMB has bearings to a waypoint. The mouse doesn't know where you are headed so can't send that info. Not sure the SH radio would display it if it did?

(Most of the explanation is here: NMEA-0183 messages: Overview)

Power with something like this:
Waterproof DC/DC Converter 12V Step down to 5V 3A 15W Power Supply Module | eBay

Quite a few wires in there (I'd whip the PS-2 plug off personally). Then I'd connect from the mouse:

Pin 1 (GND) to Yellow Wire on the power supply AND the NMEA - INPUT on the radio (?green)
Pin 2 (5V) to red next to the Yellow on the power supply
Pin 3, & 5 not connected
Pin 4 may not be needed but if in doubt to NMEA + OUTPUT on the radio (?grey)
Pin 6 to the NMEA + INPUT on the radio (?Brown)

Red and black on the power supply to the 12V battery (red via a fuse +/- switch)

Test... ...will take a few mins for first fix. This unit has a LiIon battery which means it stores the almanac from the sats for up to 7 days. If first fix is after 7 days expect slow first fix, otherwise 30seconds roughly then every second.

I'd use a sticky pad to fix the GPS in place with top surface up. If your compartment is under the seat not sure if the seat will shield signal. adding a person to seat will...
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Old 10 October 2015, 04:39   #13
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I've heard once or twice its not the size but what you do with it ;-)
That's just a rumour put about by a bloke with a small.............antenna.
Don't believe what your missus tells you, she's just being kind.

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You are right 3inch is not big - but where do you put that 3" on a SIB. No A frame, No console, it wants to point to sky...
The OP has a fixed VHF, I'm assuming he's going to mount it & not just let it flop about in the bottom of the boat. Mounting a GPS puck shouldn't present too much of a challenge, not least because he's also got to mount his VHF antenna somewhere.
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Old 10 October 2015, 05:07   #14
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The OP has a fixed VHF, I'm assuming he's going to mount it & not just let it flop about in the bottom of the boat.
Unless I'm mistake he is fixing it under the seat.
Quote:
Mounting a GPS puck shouldn't present too much of a challenge,
Are we on the same thing? To me a puck is about the size of a standard computer mouse and I agree an easy mount. But I thought you were suggesting a proper marine GPS antenna like this:

That needs to be mushroom up to work, so cant just screw into seat base underneath. anywhere it becomes a handhold! or rope catcher.
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not least because he's also got to mount his VHF antenna somewhere.
someone told him size matters so hes got a 5ft floppy one attached to transom!!
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Old 10 October 2015, 07:07   #15
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Unless I'm mistake he is fixing it under the seat.

Are we on the same thing? To me a puck is about the size of a standard computer mouse and I agree an easy mount. But I thought you were suggesting a proper marine GPS antenna like this: I am

That needs to be mushroom up to work, I know so cant ("can't" dunno what that means) just screw into seat base underneath. anywhere it becomes a handhold! or rope catcher. Ah I see! It must be impossible then. Probably better just to bodge it

someone told him size matters so hes got a 5ft floppy one attached to transom!! I suppose it would be too difficult to incorporate a mount for the GPS antenna in with the VHF antenna mount.

Maybe an engineer needs to take a look at it
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Old 10 October 2015, 07:54   #16
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Maybe an engineer needs to take a look at it
He's on a budget ;-)
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Old 10 October 2015, 08:13   #17
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That needs to be mushroom up to work, I know so cant ("can't" dunno what that means) just screw into seat base underneath. It must be impossible then.
I said "can't JUST". I didn't say it was impossible. It was the equivalent of an engineer sucking air. Its an added complication.

I think there is a very different situation for fitting out a SIB to a RIB where you have an A frame and can add lots of appendages if you want to. Just my opinion. Yes you can rig all sorts on the transom and have a whole rig of poles and such like. All with the added complexity of if he wants to ever transport his SIB deflated in a bag needing to be removable etc, while still all robust enough to take whatever the sea can throw at it and whatever someone needing to quickly grab something when getting aboard or a rope when tying up / being towed etc getting caught on it and damaging it. Plus he is using his aux bracket to mount the VHF aerial so another object around the aux may not be what he's after.

Quote:
Probably better just to bodge it
Is it really a bodge to use a GPS Mouse in a waterproof enclosure? Kaman said he found something for 60. But I'd guess thats prior to any brackets etc. So looking at probably close to 80. With a risk of it being broken by clumsy hands and ropes.

Or <30 with less risk of it being broken and more compact for use in a SIB?
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Old 10 October 2015, 11:57   #18
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This is more complex than I first thought lol!
Sib has plenty of waterproof storage to accommodate a GPS mouse style Antenna if placed in a tub.
1 In my sit on Coleman cooler .
2 Inside seat bag.
3 Inside bow box which is covered by a spray hood.
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Old 10 October 2015, 12:02   #19
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Despite only being a SIB there are several options to mount/locate either mushroom style or mouse type Antenna.
Question is will either work whilst stowed inside a box / container without a clear uninterrupted view of the sky
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Old 10 October 2015, 12:22   #20
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Despite only being a SIB there are several options to mount/locate either mushroom style or mouse type Antenna.
Question is will either work whilst stowed inside a box / container without a clear uninterrupted view of the sky

Most decent GPS receivers will work inside a non-metallic box. My AIS receiver works perfectly well inside my console. I've no experience of the "budget" end though 😏


.....sh1t happens.......
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