I'd like to see books to store treasure maps and SOS's, that let me sort by location. First of all, that would save on storage. I am tossing out low level maps and SOS's to make room. Even if we didn't get the 5:1 storage savings, it would still make organizing them easier. The real issue I have is sorting out maps and SOS's to make it easy to find a particular location, or which SOS is closest to where my boat is parked. Right now I use Excel to do that, but a BOD style book would be so much more convenient.