shape of the superstructure, location of the stack, and
length of the ship. (See figure 26.)
1. TANGO class (transport). Passenger ships or
passenger/cargo ships have the superstructure ex-
tending more than one-third the overall length of the
2. FOXTROT TANGO class (freighter transport).
Normally includes vessels used for a combination of
passenger and cargo transports. They have a block
superstructure amidships that is less than one-third the
length of the ship.
3. FOXTROT class (freighter). Primarily a cargo
type that has the superstructure amidships and a distinct
separation between funnel and bridge.
4. SIERRA class (stack aft). Cargo vessels or
tankers that have the superstructure located entirely
in the after one-third section of the vessel.
5. NOVEMBER class (miscellaneous). Fishing
trawlers, tugs, coastal passenger steamers, junks, and
The appearance of smoke on the horizon may often
be the first indication of the presence of a ship. As the
Figure 26.Superstructure group.