Originally Posted by
Pontius Navigator
A Fellow of the Royal Society for Navigation says with 4 systems in being, and ours 10 years down the line, we would be better going for sLogan as an accurate unjammable backup.
I assume by that you mean eLoran. A great system for shipping, but very little use for mobile applications . Its low frequency (100kHz) means it needs a large receiving aerial, and it is very vulnerable to local electrical noise.