- Flag signalling.
- Flashlight signalling, using morse symbols.
- Sound signalling, using morse symbols.
- Voice using a loud hailer.
- Radio telegraphy.
- Radio telephony.
- Signalling by hand flags or arms. Semaphore/morse.
CHAPTER 4: GENERAL INSTRUCTIONS
Signalling Numbers Using Interco:
- Signalling A Decimal:
- Flag Signalling: By Inserting The Answering Pendant Where It Is Required To Express The Decimal.
- Flashlight And Sound: By The Decimal Point Signal Aaa.
- Voice : By The Use Of The Word ‘Decimal’ As Indicated In The Figure Spelling Table.
- Signalling Azimuth And Bearing:
- They Are To Be Denoted In Three Figure Notations From 000 To 360 Measured Clockwise.
- They Should Be Preceeded By The Alphabet ‘A’.
- Signalling Course:
- Course Is To Be Denoted In Three Figure Notations Clockwise From
- It Should Be Preceeded By A Single Alphabet ‘C’.
- Signalling Date:
- Dates Are To Be Signalled By Two, Four Or Six Figures Preceeded By The Letter ‘D’.
- The First Two Figures Indicate The Day, Month And Year Subsequently Follow If Signalled.
- Signalling Latitude And Longitude:
- Latitude Is Expressed In Four Figures Preceeded By The Alphabet ‘L’, Subsequently ‘N’ And ‘S’ May Also Be Denoted.
- Longitude Is Expressed By Four Or Five Figures.
- These Are Preceeded By The Single Alphabet ‘G’.Subsequently The Letters ‘E’ Or ‘W’ May Be Used.
- Signalling Distance:
- Figures Precedeed By The Letter ‘R’ Indicate Distance In Nautical Miles.
- Signalling Speed:
- If Speed Is Indicated By The Figures Preceeded By The Letter ‘S’ Then It Indicates Speed In Knots.
- And If It The Letter ‘V’ Then It Is In Kilometres Per Hour.
- Signalling Time:
- Time Is To Be Expressed In Four Figure Notations Out Of Which The First Two To Denote The Hour And The Last Two To Denote The Minutes.
- The Letter ‘T’ Indicating The Local Time And The Letter ‘Z’ Indicating Greenwich Mean Time.
CHAPTER 5: FLAG SIGNALLING
To Answer Signals:
