NavList:

Locata (in lieu of or combined with eLoran) will probably be the back-up for GPS going forward. It will work in cities and underground. Link:

http://www.crunchbase.com/company/locata-corporation

Greg Rudzinski

Loss of GPS/GLONASS signals
From: Gary LaPook
Date: 2014 Apr 10, 10:51 -0700
The U.S. shut down LORAN- C to save a couple of bucks but the Brits are going with an improved eLORAN system to have a backup, I think we should too. There is some hope in this area.

http://gpsworld.com/glonass-blackout-coincides-with-loran-authorization-in-progress/

http://gpsworld.com/glonass-gone-then-back/

http://www.airtrafficmanagement.net/2014/04/glonass-failure-confirms-urgent-backup-need/

http://www.bbc.com/news/science-environment-26957569

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