Here's a copy of what I sent to my Senators & rep.
sorry about the double spacing - copy/paste artifact.
I am concerned about the shutdown of the LORAN system. Loran is run by the Coast Guard, reporting toDHS. The FAA,
reporting to DOT, has counted on Loran as a backup to the GPS system fornavigation. The GPS
satellite constellation requires 24 operational satellites to achieve95% availability. They are failing and the Air Force is
having trouble launching timely replacements.
The FAA is counting on GPS increasingly, as they promote the
Nextgen system. The FAA is also de-commissioning other ground systems like NDB, VOR
and ILS instrument approaches.The Coast Guard has a very focused opinion - is Loran a
necessary backup to GPS for marine use?
Please don't let that be the justification for Loran shutoff, as the FAA has explicitly counted on Loran as backup.
GPS reliability can be affected by various issues eg:
satellite failure, malicious attack, or ground station uplink failure. Arguments that the recent Chinese missiles cannot hit the height of a GPS orbit are specious, for that
is not the only failure mode.
Please contact the DOT and DHS to prevent the decommision of
the Loran system. Please don't let Loran die due to an interdepartmental
I don't personally fly with a Loran receiver. However, if I
were on an oceanic airline flight, I surely hope that has one.
Bill McCandless, private pilot
DHS justification for shutdown (note DOT not mentioned)
2006 FAA white paper- backup needed
2009 GAO report - launch difficulties
2007 Loran preserved -
GAO comments on shutdown
Delays in launch of new satellites