More from the book that was used to train American submariners back in the days of World War II. Thanks to EUGENE ZIEGLER (2143-+-1992) for the book once classified as ‘RESTRICTED’

11. Numerals in messages
ZE-RO
WUN
TOO
THUH-REE
FO-WER
FI-YIV
SIX
SEVEN
ATE
NINER

The pronunciation of numerals as shown on the right is now standard for all the services. The numeral “0” is spoken as ‘ZE-RO’ except in giving ranges.

For ranges, it is called ‘OH’.

When ‘00’ occurs at the end of a range, it is called ‘DOUBLE OH’.

‘000’ at the end of a range is called ‘OH DOUBLE OH’.

Other rules for the use of numbers in messages are as follows:

a) Course and bearings are spoken as three separate digits. All bearings are understood to be relative unless followed by the word ‘true’.

Steer course two fi-yiv fo-wer.
Bearing ze-ro ze-ro six.
Bearing one fi-yiv fo-wer, TRUE.

b) Speed, depth to keel, and torpedo depth are spoken as two separate digits.

Speed ze-ro six knots.
Six fi-yiv feet.
Set depth at one two feet.

c) Angle-on-the-bow is spoken as an ordinary compound number, preceded by ‘port’ or ‘starboard’.

Angle-on-the-bow, port thirty fi-yiv.

d) Angle of the boat and planes are spoken as ordinary compound numbers.

Two degrees up angle, twenty degrees rise on the bow planes

e) Time is given in standard Navy terminology.

Ze-ro ze-ro thirty.
Seventeen thirty fi-yiv.
Ze-ro ate hundred.