Date: December 7th 2006

NOTIC ADVISORY TO NAVSTAR USERS (NANU) 2006155 NANU TYPE: GENERAL * GENERAL MESSAGE TO ALL GPS USERS * An initial assessment period for SVN 23 utilizing PRN 32 was accomplished 1 December to 6 December 2006; SVN 23 is no longer transmitting L-band During this assessment period SVN 23 was broadcasting L-band and set unhealthy SVN 23 was not included in the operational constellation almanac Any users that experienced unusual performance from GPS user equipment during this period should contact the GPS Operations Center

Approximately 10 January 2007, SVN 23 utilizing PRN 32 will be turned on; transmitting L-band and kept unhealthy SVN 23 will still not be included in the operational constellation almanac The GPS Operations Center will transmit a GENERAL NANU reminding users of this activity

POC: GPS Operations Center Phone: DSN 560-2541; Comm 719-567-2541 E-mail: gps_support@schriever af mil Website: http://gps afspc af mil/gpsoc/

* GENERAL MESSAGE TO ALL GPS USERS *

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