Place mat? Yeah, we do that. You can buy a place mat of the San Juans for about $8 that is laminated. It is a great "big picture" in a small size. To be more factual, we don't "navigate" with it, but we do plan with it when we're in the area. We did the same thing in Desolation Sound. Hey, you use all the resources you have... and if it makes picturing the route easier, it seems like prudent seamanship to me. 8)