I keep track of all my detail in excell - mostly just a record of boat usage- Location trip hours, engine hrs, kms, average speed fuel used how many on board sea & swell total caught for the day.
also add any repairs service cost & other expenses related to boat & trailer starting a new page for each year I can look to see how many outings each year & total expenses
Also have pages for years to come with reminders as per when flares are out of date & life jackets need servicing etc etc.
Brett