Use my Inreach all the time… never for the “SOS” function, but I was able to text my brother to come pick me up in his airplane and fly me to the hospital. Each way, the texts take from 3-15 minutes usually.
Another option is a Personal Locator Beacon. Friend of mine was in a boat that capsized, pulled the lanyard on his PLB, and searchers were on the water within 20 minutes.
