All the boat WiFi systems in the BVI work through the cellular network including renport. Speed is mostly a function of the number of users. Crowded anchorages you will see the WiFi work much slower especially in the 7 to 10 am and 6 to 10 pm time frames. You might have zero issues streaming at one anchorage midday and a very different experience at another anchorage the next day.
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They do not all use the same networks nor do they use the same protocols. Trust me, the Renport is different.