3. DATA PRESENTATION 
There is a two-page data summary of the measurements obtained 
from each current meter. The location and depth of the instrument, the 
number of observations and the observation period are given on the first 
page. Some of this information has been repeated on each of the four 
plots found on the second page to aid the researcher interested in 
comparing the same type of plot from different instruments. 
3.1 Histogram 
The basic data was plotted as histograms of speed and of direc- 
tion. The speeds were sorted into groups of 1.5 cm/sec and the directions 
were arranged in 6° sets. The speeds seen on the histograms are higher 
than those occurring in the other plots due to the presence of high- 
frequency phenomena such as internal waves (Halpern, 1971a) and mooring 
motion and because the Savonius rotor is an omnidirectional sensor. 
Direction histograms were plotted on a linear scale to eliminate the 
distortion inherent in a polar plot. Zero degrees refers to true north. 
3.2 Statistics 
The basic data consists of N observations of speed and direction, 
1.e.5 (Sy, 03), i = 1,2,3, 206, N. We define the north (+v) - south (-v) 
and east (tu) - west (-u) components of horizontal velocity by uj = S; > 
SIN @; and Vz = Sq7 + COS 0,. 
