Leap Second Status - Motorola M12 Oncore User Manual

Motorola GPS Products
M12 Oncore User' s Guide Supplement
Revision 1.0 01/25/00

LEAP SECOND STATUS

This command polls the receiver for leap second status infomation decoded from
the Navigation Data message. The output response provides specific date and time
information pertaining to any future leap second addition or subtraction. Present
and future leap second values are also output rounded to the nearest integer value.
This command has only a polled response, thus it must be requested each time leap
second information is desired.
Leap seconds are occasionally inserted in UTC and generally occur on midnight
UTC June 30 or midnight UTC December 31. The GPS control segment typically
notifies GPS users of pending leap second insertions to UTC several weeks before
the event.
When a leap second is inserted, the time of day will show a value of 60 in the
seconds field. When a leap second is removed, the date will roll over at 58 seconds.
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