Iridium or Global Star appear to be most recommended. The issue I am seeing is the plan required for use. If I was going to use this day in and out, I get it, but packages start w 75 mins for @ $160 but they expire in 30 days, use or lose. The other package is $465@ for the contract year and then pay @ $6.00/minute for calls made. Can seem to find an "emergency use ony" plan. Also, starting to look at EPIRBs, found one under the RESCUE ME plan for a reasonable amount.