I was playing with my mini a bit. Trying to make it a little more clear:
When you first turn it on, press the down button 4 times to “location”. It says “wait for GPS”. After about 5 minutes it finds enough satellites and displays the latitude and longitude.
Press the up button three times to “messages”. Press “ok” button. it lists the messages sent and received starting with most recent. Press down button to get to a message and press “ok” and it will display the text of that message. The display is small, but the messages are limited to a small number of characters (160?) so it can display all of them.
Back at “messages” press the up button to “message” and you can enter text for a message. The letters are listed “A” to “Z”. Use the up and down buttons to get to a letter. Press “ok” to select that letter for the message. Repeat for each letter of the message. Kind of a pain but doable. I assume if you pressed the SOS button you would communicate to them similarly.
Back at “messages” press the up button twice to “preset messages”. Press “ok” to select preset message. Press down button to get to the desired preset message. Press “ok” to select it. Press “ok” again to say you really want to send it. Then it appears at the top of the list of messages with an arrow in front of it to show it hasn’t gone through to the satellite yet. When it does go through, it makes a tone and the arrow goes away.
When I get a message back, it makes a sound like a retro telephone ring and that message appears at the top of the list of messages where I can read it. It takes maybe 30 minutes of power on time on the mini to do the entire sequence if my wife immediately responds.
You can also pair your smartphone to the mini which makes it easier to type in messages and there’s a better display of messages. It uses bluetooth. The more I think about it, there’s no need for this, I’ll just use the mini by itself and the three preset messages.
Maybe that makes it more clear.