This report summarizes the results of a pelagic survey of the Smithsonian 
Northern Grid from 1200 hours 7 December through 1800 hours 13 December, 19 66 . 
P.O.B.S.P. personnel were Brian Harrington (Biologist in charge), Walter 
Bulmer, T. James Lewis, and Frank Smith. Good cooperation was received from 
Captain Kaiser, Mr. Sullivan (X0), the officers and crew of the U.S.S . 
GRANVILLE HALL (YAG 4o) throughout the survey. 
'4 • is' 
Heavily overcast weather during the first leg of the grid made navigation 
difficult and positions were estimated; they should not be considered accurate 
within ten miles. During the remainder of the grid cruise, positions are con¬ 
sidered accurate only at the time of a fix; high winds and seas were constantly 
pushing the ship as much as ten to fifteen miles off"course. The grid cruise 
track is shown on map one. 
The weather during the grid survey was generally very windy with speeds 
of up to 40 knots frequently recorded.' The effect of this on birds is dif¬ 
ficult to determine. It can, however, be stated that high winds probably 
affect observations and definitely affect collecting. Due to steady vibra¬ 
tion when heading against the sea and wind, binocular observation is difficult 
and hence probably fewer birds are seen. Also the fact that birds are often 
oehind waves affects sightings. Collecting is aljnost impossible when heading 
against the sea as a shooting station can not be maintained on the bow. 
Considering the above remarks, it then follows that this survey should 
not be considered an accurate index of the status of the birds this month 
relative to other surveys. However it is also suggested that the conditions 
were much the same as in the December 1965 grid survey, and it seems reason¬ 
able to draw comparisons between the two. But there are little data to 
