The deal I have with my wife and others who follow my spot & aprs reports is:
If the spot or APRS tracking stops don't freak out. If I don't send you a spot OK message by the agreed upon time, then you can freak out and hopefully the tracklog will give use information about where I was. Please try reaching me by cell before raising alarms.
If you look and see that the last APRS position was on the runway, I'm probably okay.
I recently turned off the spot tracking service because I'm cheap and have APRS. I still use the OK, check-in & help buttons (each coded with a different message)