I'd watch them maps for sure.Someone was just on here other day saying there map had there honeyhole way in the woods.
Now just think if you was them traveling 20-25 mph & used that,you would end up dry docked or dead.
Theres nothn ever or will ever be made to make it safe to travel that fast in the fog & dark.GPS doesnt know the waters depth nor does it know whats floating in the water
Good luck on whatever you decide to use.