If you want a simpler tracker for a single adventure, the Spot Gen4 offers reliable one-way communication and location tracking. The features here are limited compared to more capable two-way rivals, but there are some neat safety additions and it’s long-lasting. This beast will last.
It's a one-way messenger, so unlike many devices on this list, it can only send brief outbound notes and won't receive replies from people at home.
In my testing, I've used the Spot Gen4 on a variety of one-day ultra runs in the European mountains, and it's been very convenient as it allows lifeguards to know where I am at all times.
Knowing that you can program it to activate tracking when you reach or depart from a specific location, and turning it off while sitting still before turning it on when you're moving is great for saving important battery life.
The SOS feature is easy to use, and Spot Gen4 quickly sends out a metaphorical flare. There’s also a Spot Assist button that lets your contacts know you need help but in a non-life-threatening situation. For example, let’s say you’re out of gas in the desert.
Outbound messaging capabilities include SMS, email, and certain social media platforms, but these must be programmed while still in civilization. You can't just sit on a rock halfway up Kilimanjaro and do it on the fly.
Unlike most outdoor kits that currently use USB charging (headlights, cell phones, GPS watches), the Spot Gen4 runs on AAA batteries. That has its pros and cons. Battery life is great and it’s easier to replace batteries than to find a power source, but I found it a bit annoying to carry around extra kit.