THE INTERNATIONAL OODE OF SIGNALS . 665
36. Describe the three substitutes.
The substitutes are triangular flags.
1st substitute is yellow with blue border.
2nd substitute is blue with white fly.
3rd substitute is white with a horizontal black stripe across the
middle of it.
37. What are the functions of the Code flag?
(a) When hoisted preliminary to signalling it means that the 1931
International Code is to be used.
(6) When hoisted at the dip by a receiving ship it means signal seen,
and when hoisted close up it means signal understood.
(c) It is used as an answering pendant to acknowledge each hoist as
received.
(d) It indicates the decimal point in a numeral signal.
(e) It is associated with letters E, F and G9 when spelling opt words;