Improving 4G data (not voice calls) signal on boat.

EE is generally reckoned to be the best in remote bits of Scotland, because they run the emergency services network and built a lot more masts to implement it.

From a quick look at the map in the Ofcom checker I linked to above, Vodaphone looks overall as good, if not better, than EE, in Scotland, including remote bits, when viewed at a small scale. Obviously there will be advantages/disadvantages to each in specific locations.
 
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