Often people do engine checks just before starting up the engine prior to leaving. If you discover a problem then there is very often little you can do to fix in time for your departure. Result – you end up being delayed. If you do the engine checks as soon as you arrive in a port you can often get things fixed so that your departure is not delayed. This is particularly important on a UK circumnavigation as you will need to keep your schedule as much as possible. Clearly you can’t do checks such as oil checks as soon as you arrive – but you can do most.