Re:Satellite probably best bet (Score 1)

You can get access over HF SSB. I have done it using SLIP over MIL-STD-188-110A and STANAG-4285 PSK HF modems which give a reasonably reliable 2400bps. You'll need a shore based proxy to hook into and you'll have to set it up yourself. The modems are available from Fredericks and Harris for something like $5K each. You need HF radios, frequency allocations and a license to use them. The USN uses these systems for intranet style access within their task groups. I'd stick with INMARSAT M - or the Amateur radio option if you are really strapped for cash.