| Q: At what range could the following ship [wake] targets be visually detected with the probabilities indicated?
NOTE: "VISUAL DETECTION" = the range at which SOMETHING is seen for the following targets on a featureless ocean surface....it does not entail classification or identification.
Conditions:
Open ocean – no land anywhere
Absolutely clear atmosphere – no clouds, haze, particulates, etc.
Absolutely smooth water surface
1 searcher
Searcher altitude = 15 Kft
Naked eyes – no binoculars
Un-cued scanning (no prior knowledge of target’s general location)
Ship targets of interest (these are WW II vintage):
1) PT boat
a. Displacement: 56 tons
b. Length: 80 ft.
c. Beam: 20 ft.
d. Draft (at speed): 2 ft.
P detection
Speed 0.5 1.0
15 KTS.
40 KTS.
Note: The high speed is different for the rest of targets
2) “Destroyer”
a. Displacement: 3000 tons
b. Length: 385 ft
c. Beam: 45 ft
d. Draft: 13 ft
P detection
Speed 0.5 1.0
15 KTS.
25 KTS.
3) “[Heavy] Cruiser”
a. Displacement: 12800 tons
b. Length: 590 ft
c. Beam: 67 ft
d. Draft: 20 ft
P detection
Speed 0.5 1.0
15 KTS.
25 KTS.
4) “Aircraft Carrier [Yorktown class]”
a. Displacement: 25500 tons
b. Length: 782 ft.
c. Beam: 83 ft
d. Draft: 26 ft
P detection
Speed 0.5 1.0
15 KTS.
25 KTS.
5) “Battleship”
a. Displacement: 45000 tons
b. Length: 715 ft
c. Beam: 110 ft
d. Draft: 33 ft.
P detection
Speed 0.5 1.0
15 KTS.
25 KTS.
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