Has anyone said Satphone? Depending how remote you're going, they can come in quite handy for nominating and cancelling SAR times.
Last year I did a stack of ops in the WA desert, and found the Satphone we hired was indespensible. The guys I hired it from mailed it to me, and I mailed it back when we got back. Feel free to PM if you need a lead on where to get one.
