A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Mark Coady
Date: 2017 Aug 13, 09:36 -0700
I was curious at the negative thoughts toward recreation of LORAN.
I admit I was upset and biased agianst its demise from decades of use for sailing and fishing. "Fishing the 600 line" means lots coordinating between vessels off a paper chart. I realize that this is a poor basis for national new expenditures of countless dollars.
I liked it as a primary/backup. I admit, even in later days with ASF factors, LORAN was less accurate than GPS, but those of us who had dutifully kept logs did pretty well with repeatability. I always seemed to find the same mark in pea soup fog out of my own coordinate log book.
If I might ask for commentary on the following, as my knowledge does not give me the technical basis to accept or reject the explanation:
I was led to believe GPS is a very low power signal. LORAN being an earth based long wave platform, I was told it is higher broadcast energy and harder to jam or spoof. If spoofing and jamming are a reality, then any satellite system might have similar vulnerabilty? Is Loran harder to jam or modify due to wave character, or was this fiction?
Is a landbased long wave of higher broadcast energy really any better agianst the giant solar flare RF interference doomsday scenario where we lose gps at some point. Or to a megavolcanic eruption (E.G. a Krakatoa or Thera) that fills the upper atmosphere with junk. I realize these are low probability, but at least potential events.
On the water I always maintain the ability to navigate by non electronic methods, but I understand many now do not.
A backup would certainly be nice.