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1:00 p.m. GMT. Numbers indicating the day of the
month are placed before the time of the day to form
what is known as a date-time group (DTG). The DTG
171320Z means the 17th day of the current month plus
the time in GMT. Dates from the 1st of the month to the
9th of the month are preceded by the numeral 0. (For
example, 041327Z is the 4th day of the month.)
Applying the preceding facts, you easily can figure
GMT from your local zone time. Assume that you are
on a ship operating in the Virginia Capes area where the
local zone time is 1700R. The R time zone has a number
designation of +5, which indicates the R time zone is 5
hours behind GMT. Simply add 5 hours to your present
time of 1700, to find that it is 2200 GMT.
The reverse is true when computing GMT if you are
in a time zone that lies in the eastern longitude. Assume
your ship is in the Eastern Mediterranean and the time
is 0900B. Zone B has a numeral designation of -2, so
you simply subtract 2 hours from 0900 to find that GMT
is 0700.
SUMMARY
In this chapter, you learned about shipboard
watches, in-port and underway. You learned about the
conditions of readiness and how to convert time. It is
now up to you to put what you learned into use.
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