Just discovered this nifty device on the OCC Facebook site. It amplifies Wifi signals and feeds them into a router so that weak shore based stations an be accessed by all wifi device on board. Rogue Wave WiFi

Hi Simon

Currently sitting on board on the Hamble River and logged into the Universal Marina 's wifi Spark ( free so far). More importantly, using an Alfa system from Crucial Wifi. Antenna, adapter and router all for £90. So far so good.
Excellent service and advice from Crucial Wifi.

Peter