Just a heads up...

The Skymate satellite email system has capability to report your
boat's postion periodically to an email list you create. However, they
have interface issues with some models of Furuno and Raymarine GPS's.
(Including my Furuno GP-32). They have committed verbally to me to fix
the issue and I have no reason to disbelieve them, but I suggest you
ask about your particular GPS before purchasing.

They have a backup position locator if the GPS is off (or, evidently,
it they can't communicate with your GPS.) It's some kind of doppler
calculation off the Orbcomm satellites they use. It gets a position
that varies from the GPS position, normally by just 2-5 miles in my
experience. However, one night it reported that our SF Bay boat was in
Mexico. I wish...

For friends and family a few mile discrepancy is really OK, as long as
they don't panic when they see your boat on top of a mountain or
report the location as precise to a rescue orgnaization.