Talking to my parents about when we went sailing around the South Pacific in the 80's and how you kept in touch pre-Internet. They had a ham radio, they did a check-in with a friend once a week.
But then there was Pacific Net. This was one guy, a hobbyist with a big antenna somewhere in Hawaii. He did a broad cast daily at a set time. Gave weather updates and did check-ins. You'd ask to be added to his check-in list. He would ask for your check-in and you would give your location and your heading. Tell about weather conditions and any other news you had. He would give you information about your location he'd gathered from everyone else he talked with. Like "this is what to expect at the port you are headed for" etc.
If you heard someone on the check-in that you wanted to talk to, you'd ask them to switch to another channel for a private chat.
Absolute early Internet vibes.