Once you leave coastal waters and are beyond the range of cellphone and
WiFi, satphone and
SSB (ham and/or marine) are your only serious options. Do some forum searching for discussions covering SSB and satphone options for voice and
email. We're happy to discuss this, but there is already a lot of collected wisdom here in the forum
archives.
Anybody else have an alternative for at-sea
communications? I sure can't think of any...