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 POD low
 
5. Light partly or totally obscured by dayboards
 POD low
 
6. Bridge light out, inoperative bridge
 POD low
 
ROUTINE Federal and private aids.  Report by mail or telephone.
 1. Aid obscured by foliage or other objects that should be removed
 POD low
 
2. Faded dayboards
 POD low
 
3. Delaminated dayboards
 POD low
 
4. Leaning structures
 POD low
 
5. Bird nest on aids
 POD low
 
6. Improper dayboards
 POD low
 

 
F.6.b.  Examples
 Several examples are furnished below to illustrate the use of Table 10-3 and to provide amplifying remarks about certain judgments.
 
F.6.b.1.  Sinking or Submerged Buoys
 Sinking or submerged buoys (item 4 under critical discrepancies) are quite likely to be detected by trained and competent observers in an aircraft.  This is particularly true in cases where the pilot or observer has substantial local knowledge, visibility is well above minimums for flight under VFR, and the location of the buoy is such that there are numerous landmarks to facilitate orientation/navigation.  Detection of missing buoys in a well-identified harbor or marina entrance is relatively simple.  Detection of a missing buoy may be more difficult for offshore buoys if the aircraft does not have a functioning LORAN-C or GPS receiver since the aircraft has to be certain of its position to determine that a buoy is missing or off station.
 
F.6.b.2.  Buoys Off Station
 Buoys off station, adrift, missing, capsized, or stranded are also judged to have a high POD.  The fact that a buoy is only slightly off station may not be able to be determined from the air, because it is not possible to establish the actual location of the buoy.  A buoy markedly off station is likely to be detected.  Beached or capsized buoys are usually easily detected.
 
F.6.b.3.  Radio Beacons
 Radio beacons off the air or giving improper characteristics are likewise easily detected, provided the aircraft has an automatic direction finding (ADF) receiver and a light list to consult for details on frequency and characteristics.
 
F.6.b.4.  Vandalism
 Vandalism is a more difficult detection challenge.  It is relatively easy to spot vessels tied up to buoys or other ATON structures and/or persons on such structures, but the detection of damage is difficult if the damage is only slight.
 
F.6.b.5.  Aids Damaged by Vessel Collision
 Aids damaged by vessel collision are judged to have a variable POD, depending on the extent of damage.  It is difficult to distinguish the cause of damage (collision or vandalism) from air inspection.
　
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