<pre><font face="Courier New" size="2"><br />GPS OPERATIONAL ADVISORY 172<br />SUBJ: GPS STATUS 21 JUN 2006<br /><br />1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):<br />A. BLOCK I : NONE <br />B. BLOCK II: PRNS 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15<br /> PLANE : SLOT F6, D1, C2, D4, B4, C1, C5, A3, A1, E3, D2, F3, F1, D5<br /> CLOCK : CS, RB, CS, RB, RB, RB, RB, CS, RB, CS, RB, RB, RB, CS<br /> BLOCK II: PRNS 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29<br /> PLANE : SLOT B1, C4, E4, C3, E1, D3, E2, F4, D6, A2, F2, A4, B3, F5<br /> CLOCK : RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, CS, RB, RB<br /> BLOCK II: PRNS 30<br /> PLANE : SLOT B2<br /> CLOCK : CS<br />2. CURRENT ADVISORIES AND FORECASTS :<br />A. FORECASTS: FOR SEVEN DAYS AFTER EVENT CONCLUDES.<br />NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU<br />TIME START - STOP)<br /><br />B. ADVISORIES:<br />NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU<br />TIME START - STOP)<br /><br />2006046 180649Z MAY 2006 25 UNUSUFN 138/0647-/ <br />2006052 022017Z JUN 2006 30 UNUSUFN 153/2014-/ <br />2006054 071853Z JUN 2006 30 UNUSABLE 153/2014-158/1842 <br />2006055 181606Z JUN 2006 03 UNUSUFN 169/1526-/ <br />C. GENERAL:<br />NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU<br />TIME START - STOP)<br /><br />3. REMARKS:<br />A. THE POINT OF CONTACT FOR GPS MILITARY OPERATIONAL SUPPORT IS THE GPS <br />OPERATIONS CENTER AT (719)567-2541 OR DSN 560-2541.<br />B. CIVILIAN: FOR INFORMATION, CONTACT US COAST GUARD NAVCEN AT<br />COMMERCIAL (703)313-5900 24 HOURS DAILY AND INTERNET <br />HTTP://WWW.NAVCEN.USCG.GOV<br />C. MILITARY SUPPORT WEBPAGES CAN BE FOUND AT THE FOLLOWING<br />HTTP://WWW.SCHRIEVER.AF.MIL/GPS OR<br />HTTP://WWW.SCHRIEVER.AF.MIL/GPSSUPPORTCENTER<br /></font></pre>