M12 Oncore Users Guide Supplement - deetc - isel
M12 Oncore Users Guide Supplement - deetc - isel
M12 Oncore Users Guide Supplement - deetc - isel
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Motorola GPS Products<br />
<strong>M12</strong> <strong>Oncore</strong> User’s <strong>Guide</strong> <strong>Supplement</strong><br />
Revision 1.0 01/25/00<br />
LEAP SECOND STATUS<br />
This command polls the receiver for leap second status infomation decoded from<br />
the Navigation Data message. The output response provides specific date and time<br />
information pertaining to any future leap second addition or subtraction. Present<br />
and future leap second values are also output rounded to the nearest integer value.<br />
This command has only a polled response, thus it must be requested each time leap<br />
second information is desired.<br />
Leap seconds are occasionally inserted in UTC and generally occur on midnight<br />
UTC June 30 or midnight UTC December 31. The GPS control segment typically<br />
notifies GPS users of pending leap second insertions to UTC several weeks before<br />
the event.<br />
When a leap second is inserted, the time of day will show a value of 60 in the<br />
seconds field. When a leap second is removed, the date will roll over at 58 seconds.<br />
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