..............................................Vaino mentioned DGPS. This
stands
for Differential GPS. I have heard that the corrections to be applied to the
GPS data in order to become a more accurate fix are transmitted via
existing MF
or LF beacons. Perhaps Vaino can tell via a message on the reflector if what I

Yes........nearly all the MF beacons you can hear between 285 ....315 kHz  are
now transmitting diff.  Most 100  Bd ; some 200.
Also,  the Sylt Loran-C tx  (12.5 Bd PPM)  and a couple of LF stations atround
123 kHz.  With a good GPS set you can get 1-2 metres.

Walter G3JKV.