To measure speed and distance covered at sea one uses a Dutchman's log or a patent log plus a time-piece, but on small boats it seems to be more practical to learn to know your boat's performance.
Ukulinganisa isantya kunye nomgama wokugquma elwandle, omnye usebenzisa isixhobo sokulinganisa isantya senqanawa samadoda ase Holani okanye isixhobo sobuchule sokulinganisa isantya senqanawa neceba lexesha, kodwa kumaphenyana amancinci kubonakala kusetyenziswa kakhulu ukufunda ukwazi ukwenza iphenyane lakho.