"NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013034 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS *** The purpose of this notification is to inform users of an upcoming event related to the GPS satellite constellation. Air Force Space Command will be testing CNAV capabilities on the GPS L2C and L5 signals on Jdays 2013/166-2013/182. There are no planned GPS satellite outages or degradations for this activity. L2C and L5 CNAV message testing should be transparent to GPS receivers that do not process L2C or L5 CNAV. These test events will provide an opportunity for civil users and manufacturers to participate in L2C and L5 evaluation. Details on the test plan are located at the NAVCEN web page http://www.navcen.uscg.gov/L2C_L5_CNAV_Test_Plan.pdf . Any military or civil users who encounter user equipment problems during or after testing should contact the applicable POCs identified below as soon as possible. Aviation users should file reports consistent with FAA-approved procedures. Users are cautioned that L2C and L5 signals are not operational.
*** GENERAL MESSAGE TO ALL GPS USERS ***"
I was wondering if they were going to activate SVN 66 - PRN 27 before the test began. The latest II-F satellite hs been up a couple of weeks but a USABINIT has not been issued. I ran a receiver last night just to get the latest broadcast orbit, PRN has an orbit but is listed unhealthy. I turned it on anyway in my Planning software just to see what is up. I first turned on only the II-F (PRN 1, 24, 25, 27)satellites. I do not see that more than 2 are visible at any one time so there is not much L5 testing that can go on. I did not check in the polar regions for signals. They might turn on PRN 30 (SVN 49, this is the IIR-M that was modified to include the L2 signal but was bolloxed up due to crossed signal wires) in L5 mode only, but there is no broadcast orbit for it.
Then I turned on the other seven IIR-M satellites (PRN 5, 7, 12, 15, 17, 29, 31) and note that in some parts of the world 4 are visible for up to 6 hours with several short periods of 5. So some serious L2-C testing is possible.
If you have L2-C and/or L5 capable receievers you might want to turn them on to check it out.
Paul in PA
My gr3s are L5 and L2C capable, but it appears that only L1 and L2 are being used. Do you know if this is an additional cost upgrade on recievers that already have the technology in the unit? Just trying to get a handle on where I stand. I would certainly like to test L5.