bluetooth gps receiver advice

[seadago]

Hello all
I need advice choosing a bluetooth-enabled GPS receiver.

I have openCPN 3.2.0 running on a Win 8.1 tablet, sadly without an internal GPS antenna, so need an external receiver.

Looking for a waterproofed (if possible), Bluetooth GPS receiver to pair the tablet to for GPS NMEA data.

Seen a few (Garmin, GlobalSat, Holux) that look like fitting the bill, but are not waterproofed, so need to be installed in the cabin. I have a 1 inch think ply/GRP sandwich cabin roof. Doubt they will pickup a good satellite signal below deck.

My budget is about USD 150 for the entire setup.

Also, seen a few threads in the forum about several config adjustments needed by OCPN in order to receive GPS data over bluetooth. Not a tekkie, so sounds rather complex to set up to me. Would like as plug-and-play solutions as possible.

Any advise much appreciated. Thanks