TB 11-5825-291-30
No Almanac/Unit Won't Hold Data
PLGRs that have all power removed, including the memory battery, will lose almanac. If
there's a problem with not retaining the memory, be sure to check the PLGR and verify
that the memory battery is installed. Many PLGR's returned for this complaint are
missing the memory battery. See above for details.
Won't Track Satellites
Many things can cause a slow acquisition. Having no almanac or accurate times will
cause a PLGR to take longer to acquire satellites. If the PLGR is partially masked from
the sky, it may be difficult to find and acquire satellites. While the PLGR will survive a
one meter immersion, it will not be able to acquire a satellite if the antenna is
underwater. If it seems to be taking excessive time to get a fix, go to the menu and
scroll through the status pages until the satellite tracking status page is reached. This
will allow the user to watch the progress of the PLGR acquiring satellites and the signal
levels of those satellites. Remember, that in general, it requires four satellites to get a
fix. If the intent is to update the almanac, it can take 12 - 13 minutes before a new
almanac is received.
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