Skipper

Miles and speed. We take miles from tracks; average speed - distance / entire passage time, including stops within the recording. “Best in 5 minutes” is the maximum average speed for this segment according to GPS time stamps. If there are no marks or the export has spaced them evenly, we don’t create a record. All velocities are relative to the ground.

Days on the water. Each calendar day of departure is counted once, regardless of duration and water area. We take the dates in the local time of the ports. Passing midnight adds a day; several passages on one date give one day.

Night. We calculate the Sun’s position from the date and the boat’s coordinates. Night hours are the part of a passage between sunset and sunrise, including evening and morning twilight. Departure and arrival times come from the record. GPS timestamps refine the boat’s position; without them, we use progress along the saved route. Polar daylight contributes no night hours. NOAA method

Skipper and crew. On every passage of my own yachts Rassvet and Aurora I am the skipper; on other boats I sail as crew. Miles, hours and passages of both roles add up to the overall total; a day with both roles counts once in it.

Tidal / Non-tidal. By RYA determinationtidal effects should significantly influence passage planning. The Skagerrak, Kattegat and Oslofjord are classified as Non-tidal according to the practice of these voyages. Miles are distributed among route sections without double counting. This is an editorial classification.

Geography and years. Countries are counted by ports of departure and arrival; Passing past the shore does not count as a visit. Ports and marinas are united by name. Miles of water areas are distributed without double counting and are approximate. The passage refers to the start year.