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From: Mike Maurice (no email)
Date: Thu Dec 16 2004 - 16:32:44 EST
At 03:26 PM 12/16/04 -0500, you wrote:
>What makes you think the Loran signal will not be screwed up, too.
>jdl
This comment represents a major misunderstanding of the issue. Loran sets
require a fairly large antenna, GPS does not. Loran is not nearly as
precise as GPS. The repeatability of Loran is near as good, but the
absolute precision is not nearly as good. The concern with GPS is not that
it could be used to target a ballistic missile, but that it could be used
for a cruise missile, or for that matter an airplane, guided to its target
by a human pilot, I suppose. In short GPS will fit onto most any vehicle,
whereas Loran requires a big antenna and is not nearly as accurate. The
Loran will make a precise fix to the same location, repeatably, using the
same equipment, but that location is not as close to the absolute location
as GPS will come.
GPS can be turned off selectively in an area. What the size of that area, I
know not and I am not sure the information is not classified.
Considering the issues involved, it would appear that the chances of GPS
being turned off for any significant length of time over a wide area would
seem to be pretty unlikely. In any event Loran was never part of this
concern, at least not acknowledged at any public level.
In any event, if any of these assumptions were to be changed, I would
expect the public would be informed, pretty quickly.
Mike
Capt. Mike Maurice
Tualatin(Portland), Oregon
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