During the recording of a trip, the locations are recorded irregularly.
Irregular recording of individual data points during a cruise is quite normal and intentional in order to use as little memory as possible. Paotre has an algorithm that decides whether a data point is important for the recording of the route or not. If it is indeed important, the data point is saved and if not, it is discarded. The accuracy and the thresholds when a point is discarded or not can be influenced in the Settings.