Im lucky with a SIM card Ipad I can get coverage when offshore, however we dont normally go more than about 20 miles out, dont know what you would do to improve but I have an Iphone as well and have a mobile booster kit for it installed in the boat, so when the ipad starts to drop out of mobile coverage I use the iphone and set it to "personal hotspot wifi" and allow the ipad to piggy back for the internet
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