I have posted before about the H2OAudio waterproof arm bag I use for my GPS-Logir Phone and for the GW-52. Still by far the best waterproof arm bag I have found. (Thanks to Roo for bringing it to our attention 
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I have just found another company that may be worthy of a close look: www.over-board.com.au/
Here is their video of their new bike mount bag. This could be mounted on the boom for a great feedback solution (one one tack! 
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Andrew, I have had two of these first one got a small hole in the window cause might have been from me putting stuff on it in my wet box the second one burst open on a crash when I landed on it which drowned my GW-52. Maybe not the fault of the Overboard bag but I won't be buying another one. The arm strap did sit well on my arm better than Aquapac's and the screen which sits on the GPS well made it easy to read but also sitting tight if you crash as with what happen to me was the GPS punched through the plastic screen.
New GW-60 will be good no need for bags 
I have overboard bag for kayak/supping to listen to some tunes, wouldnt rely on it for windsurfing, too much pressure in crashes, pretty much same design thus failing points as old aquapacs. I still prefer pacquas provided you careful putting in/removing gps.
I agree with Mark and Glynn, the hallmark of a good waterproof bag is the width of the glued seam between the front and back pieces of waterproof material making up the bag. Both the Paqua and H2O Audio bags have at least 4 to 5mm width. The Overboard looks to be 1 to 2mm
Good to hear the feedback from experience Glynn.
Even the importer agreed they would probably not survive a big crash at speed. I found the same with the Aquapac brand.
Unfortunately for me, and perhaps fortunately for others, I can report that both of the H2OAusdio bags survived my 40Kts+ wipeout last weekend at the end of the SP run, although I did have to chase the one that was ripped from my arm. It floated well and was intact except for the press studs on the armband connection popping. (I didn't even know they were press studs until then!). The other bag was still in place, although moved a bit, on my other arm. I hit the water with great force and tumbled a few times. It was a good one! Good bag test that is. 
Select to expand quotesailquik said..
Good to hear the feedback from experience Glynn.
Even the importer agreed they would probably not survive a big crash at speed. I found the same with the Aquapac brand.
Unfortunately for me, and perhaps fortunately for others, I can report that both of the H2OAusdio bags survived my 40Kts+ wipeout last weekend at the end of the SP run, although I did have to chase the one that was ripped from my arm. It floated well and was intact except for the press studs on the armband connection popping. (I didn't even know they were press studs until then!). The other bag was still in place, although moved a bit, on my other arm. I hit the water with great force and tumbled a few times. It was a good one! Good bag test that is.
You fall off?? 
I use an Over board one now and find it heaps better for me than the Paqua ones, as in it fits snug on my female size arm, the Paqua seems to be mens arm size and it keeps sliding down to my elbow.
Select to expand quotesboardcrazy said..sailquik said..
Good to hear the feedback from experience Glynn.
Even the importer agreed they would probably not survive a big crash at speed. I found the same with the Aquapac brand.
Unfortunately for me, and perhaps fortunately for others, I can report that both of the H2OAusdio bags survived my 40Kts+ wipeout last weekend at the end of the SP run, although I did have to chase the one that was ripped from my arm. It floated well and was intact except for the press studs on the armband connection popping. (I didn't even know they were press studs until then!). The other bag was still in place, although moved a bit, on my other arm. I hit the water with great force and tumbled a few times. It was a good one! Good bag test that is.
You fall off??
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I prefer to call it a 'discretionary bail out!'
Where do you get H2O Audio ones from they look good.
I hat the aqua carnt use them they dig into my arm very uncomfortable they have **** roll up seal that digs into you.
I have used the overboard and it is comfortable and has the added bonus of earphone connection.
Quality good but agree with others can fail on the seam.
I use cheep ones from china now and put it in a good sealed bag.
Select to expand quotebyronmc said..
Where do you get H2O Audio ones from they look good.
I hat the aqua carnt use them they dig into my arm very uncomfortable they have **** roll up seal that digs into you.
I have used the overboard and it is comfortable and has the added bonus of earphone connection.
Quality good but agree with others can fail on the seam.
I use cheep ones from china now and put it in a good sealed bag.
Amazon.
But I still have one or two spares I got at a good price. PM me if interested.
Mat just recently pointed out that the have recently released a larger on that fits the iPhone 6. (not that I would trust anything with something that expensive - but it should fit a lot more slightly larger low cost Androids.
The GW-52 fits well in the standard H2Oaudio case. Don't think the GT-31 fits but I can try it.
Select to expand quoteKazza said..
I use an Over board one now and find it heaps better for me than the Paqua ones, as in it fits snug on my female size arm, the Paqua seems to be mens arm size and it keeps sliding down to my elbow.
Yes I have found it's too big but I tied a knot in it. It still is a bit lose and could slide off if I have to swim after the gear..
Yes. the GT-31 will fit, but it strains the plastic slightly. Not sure how it would go in the long term:
The GW-52 is a much nicer fit, and to my great surprise I found I could actually get two in it:
