We use a maintenance book that we probably bought at West Marine years ago. It has sections for parts, repairs, fuel,etc. It's all layed out in a very usable form and you can keep it simple or very detailed whichever is your preference. I'm sure there is something similar available on the book rack of most marine stores. We keep a seperate log of daily trips, destinations etc.
SV Laurie Anne
1988 Brewer 40 Pilothouse