Final answer:
If you have not synced your manuals since three days before your trip and are now on day 3 of that trip, they are likely not current. You should have checked for any updates prior to starting each trip, regardless of the manuals' status before the start of the trip.
Step-by-step explanation:
If your sync date is three days before the start of your trip, and you are now on day 3 out of 4 of your trip without having synced, it is likely that your required manuals are not current. Typically, manuals and operating documents used in sectors like aviation, maritime, or other fields where compliance with updated regulations is critical need to be the most current version to ensure safety and adherence to regulations. It is a good practice to check for updates before every trip, as changes can be instituted at any time. Even if the manuals were current before the start of the trip, it is essential to confirm that no updates or sync requirements have been issued since your last sync date, to ensure you have the most up-to-date information for the duration of your trip.