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    Re: GPS spoofing for real
    From: David C
    Date: 2017 Aug 14, 21:22 -0700

    eLoran has an advantage that I have not seen mentioned. Provision of GNSS is restricted to a few countries - US, China, Russia, India(?) and may be a few others. On the other hand eLoran stations can be set by just about any country. NZ is a country that depends on shipping and aviation for trade. If the NZ government wanted to I am sure that it could find $20m or $50m (or whatever the figure is) to set up an eLoran station. Build other stations in Australia, Chile and on Norfolk Island or Fiji and PNT in the Oz - NZ - South Paciic region would be independant of the big powers Could SA be turned on again?

    I do not have any sympathy for motorists who cannot read paper maps or taxi drivers who do not have route knowledge. However NZ, like other countries,  is becoming dependant on GNSS where it matters. The obvious example is civil aviation which is moving to GNSS/ADS-B with only a few ground aids. There is at least one airport in NZ where RNP approaches are common. I suspect that eLoran/ADS-B would be feasible but maybe ground aids would need to be retained at RNP airports.

    What I am suggesting is that maybe there needs to be a two tier PNT network:

    • GNSS/LEO provided by the super powers.
    • eLoran provided by smaller countries.

    Both networks would be freely available to everyone.

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