When we’re underway for more than a daysail, we always keep our charts and cruising guides out on the nav station. Open to the correct page, of course.
The only problem is that the motion of the boat and gusts of wind can cause the page to turn or, worse yet, the whole book to fall to the floor.
Quick tip: we stick a Post-It note on the page currently in use and remove any left from the previous trip. That way, it’s very quick to find the page we need — as you’re heading into a new anchorage and wanting to double-check something, the last thing you want to do is spend precious minutes finding the page again.
The Post-Its are also a good place to make any quick notes that we might need to refer to on the way, although we try to make “permanent” notes — things that would apply on future trips, too — right in the margins of the applicable page.
When appropriate, we’ll also mark the pages for fallback options and put those on a different side of the book or use a different color Post-It (say the primary anchorage post it is at the top of the page and the back ups are on the side). Again, it’s all about having the info we need quickly at hand.