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This is not a reasonable question to ask. The issue here is with how strong the cellular connection will be and that is determined by way more factors then can be assumed from your question. If I were to give you some guidelines to your question then I would say with the internal antennas this unit has, you could possibly be about a mile to a mile and a half out at sea and have adequate signal strength IF the tower(s) are locates very close to the shore. Keep in mind this device is Cellular connected and requires linking back to the terrestrial cellular service back on land.
Sorry, there was a problem. Please try again later.Not sure if I can help but if you can get At&T mobile service then this will work. not sure how far out you would be able to go,
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