Worth having? I like mine. It helps jittery family at home feel more comfortable, because they are able to follow your progress, see where you are, and know that you CAN make a 911 call for help if you really need a rescue.
Last summer I used it on a 7-day JMT hike. Family and friends got a kick out of watching our progress. The track image from that trip is below. SPOT gives you a web page link that shows up to the last 7 days access points on an interactive map. Check MooseTracks' signature line for hers.
Here are some drawbacks:
• It works better if placed face up to the sky. The belt-clip feature is not the best. I tied mine to the top of my pack. A better place is attached to the top of a shoulder strap.
• Down in a canyon, it may not send out a signal, or the ones getting out report the wrong location. Richard P has shown some wild ones from Whitney Portal. Mine sent some inaccurate ones from top of Vernal Falls. Mine could NOT get anything out along the lower 5 miles of the Bubbs Creek trail out of Roads End in Kings Canyon.
• The "Call for help" and "911 emergency" buttons can sometimes be activated accidentally. You can find several instances on the web where the user put the unit inside the pack, then at some point, when the pack must have been leaning on something, pressed the button. It sends family, friends and rescue people into a tizzy.
• The "call for help" idea is pretty useless. What are you going to do -- have your friends or family come and haul you out? If you REALLY need a rescue, you are going to use the 911 button. I have the cheaper service where I didn't pay for the "tracking" feature. So I use the "call for help" for that purpose -- it sends a signal every 10 minutes for an hour. Tracking sends the 10-minute signals for 24 hours.
• It only has a couple of blinking lights that indicate what mode it is in. That part could be improved. You have to stare at the lights to see when a signal is being sent. (I've observed that the first signal is sent at 45 seconds after activating a button.) I think it sends a repeat signal at 5 minutes. The satellite receiver service discards duplicate signals (the second one at 5-minutes if the first got out ok.)
Based on a survey of current customers, SPOT is working on an improved unit. It will have protective covers over the sensitive buttons. Can't remember much else about it.
I wish they would improve the unit to where you could at least send out a numeric code of your choice. They obviously send out different codes based on the OK, Track, help, or 911. Seems like they could open it up a little more. A short text message would be outstanding.
Here's an on-line description/review.Here's that picture fishmonger was referring to:
