Agreed. Save your efforts for studying. Most I know (Navy guys) brought their mil logbook with some sort of summary (most done on spreadsheet) and separate civilian logbook if they had one. Since everything is done online, they are not trying to make things add up in your logbook. It's already done in your online submission. They are just going to skim your logbook to make sure there is nothing unusual and that it appears to match what your online numbers show. The logbook portion of your prep for interview is basically done by the time you get to the interview. All the work is in making sure it adds up and is correct as you get your numbers together to input online. Pick a way that you plan to do it that works for you, and just be consistent.