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Not directly answering your conundrum on wrist computers, but—I go trail running frequently (in Hong Kong), so I've thought a bit about wearable devices and safety. Here are some of my solutions and thoughts:
I use a forearm armband (example) to hold my phone in a position that allows me to use and see the touchscreen while running. I find this incredibly useful for checking a GPS map on the run while keeping both hands free for falls. I worry that the current generation of watches are nowhere near as capable as my phone.
I rely a lot on Strava's online route creation tool and phone app for navigation.
Digital personal locator beacons on the 406 MHz channel (example) are the current gold standard for distress signals.
Sharing your location through your phone (e.g., on Google+) can give some peace of mind to your family and friends.
An inactivity detector based on a phone's accelerometer might be a useful dead man switch for sending a distress SMS/email in the event of an accident that renders you incompetent. I haven't gotten around to setting this up on my phone, but here's an (untested) example of an app that might work.
In case of emergency, it might be useful to have a GPS app on your phone that can display your grid reference so that you can tell rescuers where to find you.
Indeed so - but as far as I've been able to dig up so far, they require a bit more gold than I can afford.
Such beacons are required to be (re)programmed with a serial number appropriate for the country they're to be used in, which can only be done at an authorized dealer, which makes online purchases from other countries almost pointless. As near as I can tell, the nearest place I can get such a beacon is at mec.ca , where the least expen... (read more)