Hi  - the navigator last year tried several spots near St. Barth's and St. Martin then near Guadelope. He had limited success. I'll be trying this year - I was looking for a cell tower map but no luck. If I find anything out, I'll pass it on ...

well, it ended up that I had cell service for quite a lot of the race, and I think one could reasonably plan on using nothing else for this race.

really, the only problem would be if you wanted to download a lot of position reports.  you wouldn't get them when you were in between the islands.