Fog Signal Distance Finding for Halfway Rock (1954-1961)

For 2 minutes For 1 minute
RBN Off 52
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5
 
  FS Gp of 2 blasts ev 60s
(3sbl-3ssi-3sbl-51ssi)
53
 
 
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1
 
5
 
 
 Shows of dash of RBN or
 blast of fog signal.
Figures show seconds.
RBN Code: