Do you travel to areas where there is poor cell phone coverage? Have you thought how you in an emergency get help to those places, without any reception? Well, here is one option for you: SPOT.
You can get a SPOT for under 200€, but you also need a trace service to get your SPOT to work optimally, which costs around 100 € per year. You can get the older SPOT model less expensive, eg Marinekauppa.com sells the older model for 99 €.