156°W 
[COVERAGE (CONCENTRATION) 
[Jie free 
<0.1 (open water) 
0.1 thru 0.4 (scattered ice) 
[LITT] 05 thru 0.7 coroken ica) 
KS 08 thru 09 (close ice) 
RS 1.0 (consolidated or fast ice) 
COVERAGE BY SIZE 
Cn 
MM My 
fn =tenths of slush, brash, and block 
044 
A 
063 9OW10Y 
GIANT FLOE 
KEY TO ICE SYMBOLS 
A 
&% dominant, % secondary 
Si=Siush = W=Winter ice Snow 
Y=Young ice Pi=Polar ice 
Examples: 
THICKNESS AND SNOW COVER 
Thickness: y where n= feet and inches 
n=depth to nearest inch 
C=ice uniformly snow.covered 
D=snow cover in drifts 
O=no snow cover present 
AA Rafted ice 
NW Ridged ice 
ONO Hummocks 
Extent: H=very extensive 
L=few present 
gal LN 
GOW, 40PI’ Ww" 
WATER FEATURES 
pee Pats 
Puddles: dominant amount 
win. tenths unless 
frozen or rotten 
F=Frozen R=Rotten 
Examples; ea Le a) 
3 °F R 
Her Crack <= Lead 
SOWS50Y 
n,=tenths of small and medium floes 
fy=tenths of giant floes and field 
© Polynya 
ICE OF LAND ORIGIN 
A Icebergs—many (>20) 
A Icebergs—tew (<20) 
—— Observed 
——— Estimated 
© © © Limit of observed data 
172°w 
@ Bergy bits and growlzrs (>20) 
O Bergy bits and growlers (<20) 
When no entry appears beneath 
symbol extent is moderate 
Examples: 
very extensive ridging 
H 
AA =moderate rafting 
e090 =few hummocks 
180° 
172°E 164°E 156°E 
7S 
A 76s 
016 9O0W10Y 
74S 
72°s 
70°S 
68°s 
26 NOVEMBER I960 
172°E 
FIGURE 67. RESULTS OF AERIAL ICE RECONNAISSANCE, ROSS SEA 
97 
