Check out the DeLorme InReach satellite messenger. For what you are describing it would work much better. It has a subscription fee, about $25, and various monthly plans on top of that. You can turn the monthly plans on and off though so you are only paying them on months you are using the unit. With the Rhino, if you get in trouble and need help, somebody will have to be in line of sight to signal them. With the InReach, you just hit the sos button and help is on the way or you can send a text that will go to cell phone or email or both where you are at. I use this elk hunting and I can send my wife a text every evening when I'm done hunting and back at camp, they can also respond to you and it has very very good battery life. I don't always get on here, so if you have any specific questions, shoot me a PM