frant said..
What you need is a Telstra 4G WiFi plus device or similar approx $100. plus prepaid SIM card for data. This device can connect up to 10 devices via WiFi. It is powered by USB connection. This device will be adequate from inside for up to 5 miles offshore at least. The device does have two antennae ports and if connected to the appropriate external ariel(s) for 4G spectrum will give coverage to about 100 miles offshore. I have an external 9dBa 3G ariel on my boat which gives me coverage over all Bass Strait.
On deliveries I use the device without the external ariel and yes I have put on in a dry bag and hoisted it aloft to attempt to improve offshore reception.
Interestingly in the last delivery I did the boat (carbon fibre) had lights in the hull which provided a nice internal ledge to sit the device on facing the coast. I am not sure if it was coincidental but it seemed that signal strength was maximum with the device just above water level (on port tack heading south.) I wonder if the signal was bouncing off the water surface and amplifying.
If you are not with Telstra then forget cover so the prepaid is way to go.
Thanks frant, very useful input.
regards,
allan