How much room is there for notes?
There is enough room for a couple of lines of notes.
I honestly never ended up using the thing, but if I remember correctly, there was a fair amount of room to write some notes in about each dive before you got the next section where you had to start putting in the specific dive info. I'm fairly certain, but not 100% because I don't have access to the thing right now. Still, my memory is good and I remember space for notes...(1/2 page maybe)
There is room for 4 or five sentences of notes on one page and all the dive data on the other. Five entries can be put on each two page spread. I love it. I have all my dives for 10 years in these books. You won't be disappointed.
It's a basic log book. I don't keep a lot of notes on dives, as I tend to revisit the same sites around Catalina Island: mostly viz, water temp, buddy's name, name of boat, etc. If you're documenting training for advanced certs, you might want a larger book.
My only problem is remembering to use a ball point pen due to the glossy stock.
Palm Desert CA
For each dive (55 in log), there are dedicated spots to log Date,depth, visibility, location, dive type and times (but not water temp), as well as a small free-form area for other notes (about .75" x 4"). There are also 5 pages at the end that are nearly wide open that are apparently intended for drawing more detailed maps of your favorite sites.