NAVIGATION PLAN "B" 



General 



This backup plan assumes that MIZAR's computer tracking may be inoperative and that 

 the CTFM sonar equipment is working. 



Sequence of Operations (See figure G-2) 



1. Based on surface navigation and bathymetry, MIZAR sets two bottom markers. 

 Marker No. 1 is set as near ALVIN as possible. Marker No. 2 is set at the same depth as 

 No. 1 and about 2,000 yards from No. 1. 



2. MIZAR alternately interrogates the two markers and plots her position relative to 

 the markers. 



3. MIZAR tracks ALUMINAUT on the surface with radar and talks her into position 

 over marker No. 1. 



4. ALUMINAUT dives to the bottom and is tracked by MIZAR. 



5. MIZAR plots her position relative to the markers. 



6. If necessary MIZAR (who is tracking ALU1V4INAUT) guides ALUMINAUT toward 

 marker No. I. 



7. ALUMINAUT finds marker No. I with her CTFM sonar in transponder mode (max- 

 imum range of 800 yards). 



8. ALUMINAUT conducts sonar search for ALVIN using the CTFM transponder as a 

 navigation reference. 



9. ALUMINAUT finds ALVIN and reports her position relative to the CTFM transpon- 

 der on marker No. 1. 



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