156°W 164°W 172°W 
KEY TO ICE SYMBOLS 
[COVERAGE (CONCENTRATION) ] [ace] 
A 
[Jes ten % dominant; % secondary 
Si=Slush = W=Winter ica 
Y=Young ice Pl=Polar ice 
<0.1 (open water) 
0.1 thru 0.4 (scattered ica) A 
60W, 40PI’ W 
(LITT) 95 thr 0.7 coroken ie) 
A 08 thr 0.9 (close ica) Pd 
= F Puddles: dominant amount 
Reg] 1.0 (consolidated of fast ice) in tenths unless 
frozen or rotten 
COVERAGE BY SIZE F=Frozen R=Rotten 
patneS Examples: £2, Pd Pd 
arr xamples: 3 se 
n=lenths of slush, brash, and block tase Crack S—— Lead 
n,=tenths of small and medium floes eS Polynya 
ny=tenths of giant floes and field 
ICE OF LAND ORIGIN 
BOUNDARY A Icebergs —many (>20) 
—— Observed AX Icebergs—tew (<20) 
Examples; A A 
FIGURE 66. RESULTS OF AERIAL ICE RECONNAISSANCE, ROSS SEA 
vote. 
Estimated @ Bergy bits and growlers (>20) 
© © © Limit of observed data 2 Bergy bits and growlers (<20) 
180° 
THICKNESS AND SNOW COVER 
Thickness; u where n= feet and inches 
SSSS 
SISA CG 
n=depth to nearest inch 
C=ice uniformly snow covered 
D=snow cover in drifts 
O=no snow cover present 
AA Ratted ice 
NA Ridged ice 
OOO Hummocks 
Extent: H=very extensive 
L=few present 
When no entry appears beneath 
symbol extent is moderate 
Examples: 
AM very extensive ridging 
AA =moderate rafting 
200 =few hummocks 
180° 
96 
164°E 156°E 
78S 
76s 
748 
72S 
