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voor de liefhebber van WO1 :)

1907 Submarine Signals

SPECIAL   SUBMARINE   SIGNALS 

The following signals, though not part of the Rules of the Road, are prescribed for submerged submarines in  emergency  situations  involving  rising  to  periscope depth or surfacing. 

1. A yellow smoke flare fired into the air from a submarine indicates that the submarine is coming to periscope  depth  to  carry  out  surfacing  procedures. Ships  should  clear  the  immediate  vicinity,  but  should not stop propellers. 

2.  A  red  smoke  flare  fired  into  the  air  from  a submarine is a signal that the submarine is in serious trouble and will surface immediately if possible. Smoke flares of any color, fired into the air at short intervals, mean that the submarine requires assistance. All ships in the vicinity should stand by to give aid. 

RESTRICTED-VISIBILITY    STEAMING Restricted  visibility  is  defined  as  anything  that restricts regular visibility to a degree that endangers safe   navigation.   Many   people   think   of   restricted visibility as just fog, but restricted visibility can be caused by many other things; rain, smoke, heavy seas...

Met dank aan fjh voor het materiaal en Homing Device :)