I have a Spot Messenger that is feeling neglected and has requested a new home. It has worked great for me for 3 years, however I haven't been using it this year.
This is the older version. It has 4 pre-programmed message options. 1 & 2 are whatever you set, 3 is a distress signal, 4 is SOS to search and rescue. It also has tracking if that interests you.