barrysmith1010

Best solution I found was to buy any old cheapo 3G (or 4G) phone with a Three contract SIM with unlimited data (not a specific data contract as they are a rip off) then install EasyTether. Buy an WiFi router capable of running OpenWrt (e.g. Linksys WRT1900 AC) and install this with a USB cable running out of the boat (ideally somewhere in the well deck under a cratch cover, but you could run it anywhere so long as the length is kept under 5metres. Install EasyTether on the router also. To use the internet just plug the phone into the USB cable somewhere outside the boat, disguise phone in a plastic box even and connect your laptop/tablet to the WiFi on the router. This will get Internet access for any device on the WiFi network all routed through the mobile phone, and because of EasyTether Three won't know you are using tethered data so you'll have a truly unlimited data allowance rather than paying a lot for the Data only SIM cards.