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Time zone Most generally speaking, this means a geographical region within which the same time is used. The time system in use, however, can be either a "zone time," more common for navigation, or a "standard time," which is more common for daily use outside of navigation — although there are no hard and fast rules for practical navigation. In the end, we need to know GMT (now often called UT), and it does not matter at all what time system we work with so long as we can in an error-free manner always know GMT. See zone time, standard time, GMT and UT. See: sextant sight, standard time, time zone, universal time, watch error, watch rate, watch time, zone description, and zone time. See also: Time Keeping in Navigation and Weather.

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