Hello I’m not in any way affiliated with the following free app but I downloaded it out of interest and think it might be perfect for logging where one leaves a tent or arranges to meet a friend. (I remember when I used to have to leave a handwritten message on the message board in the hope a passing friend would notice it and read it so the following seems pretty useful to me) the app is called WHAT3WORDS and allows you to use three words to tag gps coordinates and share them with friends or yourself.
naturally if your friends are all on iOS devices you can use Find My but as this works cross-platform it might be useful.
Anyway, if you have better ideas please let me know. Simon.