I'm not a native speaker either and I think what threw me off was the "Man Overboard" bit, which is usually used as a "maritime call" so to speak. So in other words, it wasn't clear to me who was overboard, the father-son duo or somebody else. What I think the title should have been is "Ghost Boat with Garmin GPS Leads Father-Son Duo to a Man Overboard", notice "a man overboard" to clearly indicate that they were led to someone who was overboard.
It’s not your fault: the title is very confusing to me and my mother tongue is English. Perhaps finding it confusing is a sign that your English is very good.
Fair enough. I can see how you could have reached that conclusion. I suppose it's written for a native speaker.
For what it's worth, ChatGPT "comprehends" it correctly so perhaps one day we can have a headline auto-expander.
I'm a native english speaker but don't really have a marine background. I also read it as the father/son somehow going overboard.