I applaud you for being prepared and willing help others! The Garmin In-Reach is an excellent product.
I’m in my mid 60s, fish remote water a lot, and often alone. I use a mobile Ham radio in my SUV equipped with the global Automatic Packet Reporting System (APRS). The system is widely used for SAR and state-county-local emergency operations.
The radio broadcasts its (my) amateur callsign, GPS coordinates, speed, and a short status message every 5 minutes. It can also be used to send internet email via the Internet APRS backbone of “iGate” gateway stations, which reports the (last) GPS coordinates transmitted by all APRS-equipped radios worldwide with their amateur callsigns on a website.
So I turn it on while travelling to/from my destination. When I get to my destination I send an email to my wife’s cellphone text mail address that contains “Hi I am heading upstream or downstream, I Love You…” She gets the text with a link to the APRS map personalized with my callsign and the GPS coordinates imbedded to pinpoint and show my location on the map with a little “Jeep” vehicle icon. The url for the map personalized with my callsign does not change and she has it saved as a Favorite-Bookmark in her internet browsers so she doesn’t have to wait for a text to see where I am.
If I had a mobile radio with “Cross-Band Repeat”, I could use my handheld to transmit my APRS position on a different frequency and the more powerful mobile would relay (repeat) into the global network via a gateway station while I am fishing. My next mobile radio will have that feature.
When I get back to the car I send another text message with “Lots of fish…” ETA @ home… “Love You”, then leave the radio transmitting my location every 5 minutes as I make my way home.
Not as nice as a Garmin In-Reach (there are some deadspots in one mountain drainage I occasionally fish) and while the handhelds are small they are not as compact as the In-Reach. But I’m a licensed “Ham” radio operator anyway and use my radios for pleasure as well as national-state-local emergency operations. The APRS came with my radios, there are no monthly fees, and no limits on the number of status-location transmissions or messages that I can send.