See SPOT run...

And, as has been mentioned elsewhere, the live track is IMHO, the best
feature of SPOT, especially now that the share page is easily
available.

With live tracking on, if you have an accident that incapacitates you,
and the ELT (if you have one) fails, the SPOT bread crumbs will give
the search party a clue about where to start looking.

It's not perfect, since the reports are not always every 10 minutes -
I've seen a gap of an hour while driving cross country with the SPOT
on my dash last week, but the track is still pretty good.

It's also possible to send an occasional OK message without too much
hassle:

With live tracking enabled, press and hold the OK button until the LED
flashes red

Once it goes out for good, tap the OK button to send the message

Set a countdown timer to go off in 5 or 15 minutes.

If the timer was set for 5 minutes, turn off SPOT, turn it back on and
enable live tracking

If the timer was set for 15 minutes, the OK LED should no longer be
blinking, so just press and hold OK to reenable live tracking.

The timer and alarm is important as you will no doubt forget to
reenable live tracking without it!

The manual OK message is the only way to push a message to someone
with a mobile phone and no web access.

-Tom