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Dry docks
 New or discontinued.
 Easily visible from the air.  Observers need to be familiar with the appearance of a dry dock.
 
Duck blinds
 Temporary or permanent structures.
 Generally visible from the air.  Likelihood of detection may vary with the season and lighting.
 

 
F.6.  ATON Discrepancies
 This section describes common discrepancies with ATON.
 
F.6.a.  Navigation Discrepancies
 Table 10-3 presents a brief list of common ATON discrepancies, partitioned into the conventional classifications of critical, urgent, and routine.  For each discrepancy, a subjective (but informed and conservative) estimate of the POD from a typical Auxiliary aircraft is provided.
 
NOTE Note glasses
 
 
 

 
Table 10-3 ATON Discrepancies
 
Class and Action Required
 Discrepancy
 Remarks on Aircraft Detection
 
CRITICAL Federal aids only.  Report discrepancies by radio.
 1. Aid totally covered or shrouded in ice
 POD likely to be high
 
2. Light signal showing improper characteristics or rhythm
 POD low
 
3. Light signal obscured or extinguished
 POD can be high, depending on circumstances
 
4. Sinking or submerged or extinguished
 POD likely to be high
 
5. Buoy off station, adrift, missing, capsized, or stranded
 POD likely to be high for buoys markedly off station, missing, capsized, or stranded
 
6. Radio beacon off the air or giving improper characteristics
 POD likely to be high if aircraft is equipped with proper ADF and current light list
 
7. Vandalism of aids either in progress or the result of such action
 Variable POD, depending on type and extent of vandalism
 
8. Aids damaged by vessel collision
 Variable POD, depending on nature and extent
 
9. Collapsed bridge structures and fender systems
 Variable POD, high for major damage
 

 
 
Table 10-3 ATON Discrepancies - Continued
 
Class and Action Required
 Discrepancy
 Remarks on Aircraft Detection
 
URGENT Federal aids only.  Report by telephone or radio to Sector or Group.
 1. Dayboard missing or damaged by causes other than vandalism
 POD variable
 
2. Sound signal failure; whistle, bell, gong
 Detection impossible
 
3. Radio beacon timing sequence incorrect
 POD high if aircraft equipped with ADF and light list
 
4. Light burning dimly or showing reduced intensity
　
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