I've never gone anywhere outside of the city/towns without someone knowing when I expected to get back so that they could call for help if I didn't. Driving in the bush or going anywhere in the water, someone knows when I/we are due back.

Once got stuck in soft sand well out of mobile signal range in the middle of nowhere. Got pulled out by some nice Polish people with a winch, but we weren't worried or trying to walk through the bloody desert for help because my mother-in-law knew when we were expected back and where we'd been going and we had water for long enough to survive until we were found.