Standard Knee. Timber knee so placed that one arm is horizontal and the other is vertical. Standard Nautical Mile. An invariable unit of length on which speeds and log registrations are based. Usual value, for British shipping, is 6080 ft. This is equal to length of one minute of the meridian in Lat. 54° 05’
Standard Port. A port, or place, for which daily predictions of times and heights of tides have been calculated, so that tidal times and heights at certain other ports can be deduced from those at the standard port.