Word Origin & History. amber mid-14c., ambergris, from O.Fr. ambre, from M.L. ambar, from Arabic 'anbar amber, a word brought home to Europe by the Crusaders. The sense was extended to fossil resin c.1400, which has become the main sense as the use of ambergris has waned. This formerly was known as white or yellow amber. In Fr., they are distinguished as ambre gris and amber jaune. Cf. also electric.
It depends on how closely he needs to describe the location. One degree of latitude is one nautical mile or about 6000 feet, so one second is about 100 feet. The fractions of a second are pretty useless, but degrees, minutes, and seconds are reasonable.
You can view more details on each measurement unit: ft/s or knot. The SI derived unit for speed is the meter/second. 1 meter/second is equal to 3.28083989501 ft/s, or 1.94384449244 knot. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between feet/second and knots. Type in your own numbers in the form to convert the units!