In our coastal waters, especially north of the Broughtons, charting isn't optimal and gunkholing is popular. So entering a new area with the potential of problems doing maybe three knots with forward sonar is a plus in my books.
I just watched a video of Prince Rupert with a guy bringing his boat in and I was surprised at how many logs there were bouncing around. So when I approach Prince Rupert, probably next summer, I'll be doing something like 3 knots approaching so I can avoid the logs.
The Garmin radar is suppose to be decent at seeing logs that are on the surface, deadheads floating below the surface, not so much. I plan on using the forward sonar at 5 knots or less coming into areas I'm not familiar with. I was listening to an electronics lecture by Jeff Cote of Pacific Yachting Systems and he tells the story of heading into an area in the Broughtons with an island not on any chart, same with shoals.
The areas above Desolation Sound into Alaska are not charted as well as areas further South where there are ten million boaters.