The logs would contain some information but probably not enough specifics, to counter any spinning, in most cases.
They'll contain a lot of info since they are to record all speed and course changes; firefights, and other important incidents. The logs for the period over that Christmas would show where to boat was. If it's tied to a pier that would have been entered including the exact time the first line was over. If underway it would show the time and date when the last line was cast off along with all speed and course changes and that could be mapped out. It should also show the time and date that some CIA agent (per his website) was inserted by Kerry and his boat into Cambodia.