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Weather Observation and Reporting, Continued
Rules for
Using CNOC
3140/8
CNOC 3140/8 is an official document and is the only record of weather
encountered by the ship. All entries must be neat and legible. Care
should be taken to avoid writeovers and partial erasures that confuse the
legibility of the data entered. It is recommended that a folder or board
be devised to protect the form between observations. An original and
one duplicate of this form is required for each day’s observations. The
duplicate may be a rewritten copy, a carbon copy, or a suitable
photocopy of the original form. The duplicate should be retained for a
minimum of 1 year as part of the ship’s record. All entries should be
made with a black lead pencil (No. 2 or 2H) or an erasable ball-point
pen, if available.
Corrections may be made by erasing the erroneous data only if the data
has not been disseminated by any means (phone, radio, and message
transmittal). Erase the erroneous data from all copies of the form and
enter the correct data. When a carbon copy of the form is made, care
must be taken to prevent carbon smudges on the duplicate copy.
If an error is discovered in encoded data after it has been transmitted,
the erroneous data may not be erased. Using a red pencil, correct the
error by drawing a line through the error and entering the correct data
above it. Retransmit the observation with the corrections.
You must refer to the Manual for Ship’s Surface Weather Observations
(NAVOCEANCOMINST 3 144.1 Series) for step-by-step instructions on
how to complete each column. A new form must be started at 0000
GMT each day. The 2355-59 observation will be the first observation
of the new day. If the lines are filled in part I before the day is over,
continue the observations on a new form. Continue to make entries in
column 90 and part II on the first form.
In the following tables you will find an explanation for each column of
both parts I and II of CNOC 3140/8. The example figure provided
gives sample data from actual observations on part I and encoding for
part II. Use the table and figure together to learn about the information
contained within parts I and II.
10-31
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