LORAN
Never knowingly completely lost but suffering mild intestinal instability on occasions, I hesitate to comment on eLORAN but numerous Atlantic and Pacific crossings in the mighty Hercules necessitated a number of chain changes on LORAN C "The range being 800nm" and the respective pond crossings were in excess of 2000nm. There were buttock clenching moments when the signals of the next chain were as elusive as owl poo and one was already in skywave on the chain about to be abandoned. With no Navs capable these days, one would wonder from whence cometh the confirming sun/star/moon shot to resolve the bag of nails one has just reset the nav kit to before DRing the next 30 mins to the next fix. At least we were only going 310kts.