Since i live in the pacific northwest, i live on the coastline and go out fishing a lot. We bought one awhile back and rarely use it.
It is very complicated and 95% of the time u are so busy worrying about everything else u forget to even suse it.
But one thing it was great for is when we would boat out to the islands we would start it and it would record a trail of travel how we got there and back. so all the main fishin places and islands we travel to we have programmed in and when we get trapped in fog out there we turn her on and it shows us the exact route back to the mainland, rather than not see where u are going and run into rocks.
We have had it for 6 years and maybe use it 1 out of every 10 boat trips