Figure C-1. Drift tracks for 

 International Ice Patrol's 

 1985 TODs. 



Tracks presented include data 

 through 30 October 1985. The 

 symbol ( ) indicates deployment 

 position of the TOD. The Julian dates 

 beside the tick marks correspond to 

 events discussed in the text. 



As of 30 October, only one of the 

 TODs (#4544) remained in the IIP 

 region (Figure C-1). Two of the 

 TODs (#4537 and #4546) failed 

 on deployment. TOD #4526 was 

 deployed on 1 April. Between 

 1 1 April and 3 June, only one 

 position was received. After 3 

 June, TOD #4526 performed 

 without problem. Two TODs 

 (#4536 and #4548) were 

 recovered by fishing vessels. 

 Four of the TODs (#4529, #4541 , 

 #4544 and #4550) are still drifting 

 and providing data while two 

 other TODs failed after 1 1 days 

 (#4527) and 178 days (#4526). 



Only two of the parachute release 

 mechanisms (TODs #4550 and 

 #4544) were observed to operate 

 following deployment. The actual 

 fate of the remaining TOD 

 parachutes is uncertain. We 

 assume that when the parachute 

 collapsed, it settled into the water 

 and, at worst, ended up acting as 

 a near-surface drogue. TOD 

 #4536 was observed from CG- 

 1504 on 1 8 July, more than two 

 months after deployment, with 

 the parachute wrapped abound 

 the TOD hull. The parachute was 

 still attached to the TOD when it 

 was recovered by a fishing vessel 

 on 5 August. There are no 

 significant differences in the 

 velocity distributions for TODs 

 with confirmed parachute 

 releases and those without, 

 suggesting the parachute, even if 

 it remains attached to the TOD 

 does not significantly affect the 

 drift of the TOD (Figure C-2). 



The below discussions include 

 TOD data through 30 October 



Figure C-1a 



Srw 56 55 54 53 52 51 50 49 48 47 46 45 44 

 52N-I » / I 1 1 1 t-T — I 1 1 1 1 1-7*=+- 



42 41 40 39W 



52N 



40N 



-I H 1 1 1 1 1 1- 



■ 43 



■■ 42 



41 



+ 40N 



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Figure C-1b 



52N 



57W 56 55 54 53 52 51 50 49 48 47 46 45 44 4342/ 41^40 39U 



—I 1 1 tH 1 \ ► >— 



40N 



-\ 1 i 1 1 1 f 1 1 1 1 1- 



40N 



57W 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39W 



57 



