The Garmin inReach Messenger Plus is a satellite communicator that allows you to send and receive messages, even in areas without cell service. It is a great product to keep in a general aviation cockpit for safety planning because it has a number of features that can be helpful in an emergency.   

• SOS function: In the event of an emergency, the inReach Messenger Plus can send an SOS message to Garmin Response, a 24/7-staffed international emergency assistance coordination center. Photo and voice messages can also be shared during an SOS, giving response coordinators the ability to see and hear details of the emergency firsthand.
• Two-way texting: The inReach Messenger Plus allows you to send and receive text messages, even in areas without cell service. This can be helpful for staying in touch with friends and family on the ground, or for getting help from air traffic control in an emergency.
• Location sharing: The inReach Messenger Plus can share your GPS location with others. This can be helpful for letting people know where you are in case of an emergency, or for helping search and rescue teams find you if you are lost.
• Weather updates: The inReach Messenger Plus can provide you with weather updates for your current location or your destination. This can be helpful for planning your flight and avoiding bad weather.

The inReach Messenger Plus is also durable and built to last. It is water-resistant and can withstand extreme temperatures. The battery can last for up to weeks on a single charge, depending on usage.   

Overall, the Garmin inReach Messenger Plus is a valuable tool for any pilot who flies in remote areas or in areas without cell service. It can provide peace of mind knowing that you will be able to communicate in an emergency.