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Haggar said... Is it best wearing these GPS inside your sun shirt / wet suite beacuse these are a bit bigger then the foretrex 101/201's

No, don't wear inside any clothing, the wet material, (especially if it's salt water) will screen out the satellite signal, and give you poor results.
Some of the serious sailors are now using 2 units, one in the helmet for best satellite reception and one on the upper arm for viewing.
I'm using the H2Otech made by JP777, haven't had it that long, but it's a better fit than the big aquapak, and sits on the upper arm better.