If Mini Me can't get a signal or location to send a message immediately, it sits in an invisible outbox. Sometimes that message doesn't transmit until the next time I turn the unit on to start a different activity. So it gets confusing if people receive a message that says "I'm back at the car." when I actually just set out on a different trail.
It got even worse last weekend when we were backpacking and I sent a message that we were snug at camp for the night (which didn't send) but 20 minutes later was sending that a wind storm had come up and we were bugging out. There was no way to unsend the first message. In this case it was a problem because we were accompanied by some of my daughter's friends and these messages were going to already-anxious parents!
sb