shen, every last country signatory to the radio treaty of 1920 (1919?) required
their radio stations to broadcast their call sign, frequency and city every ten
minutes they were on the air. This was done specifically as an aid to
navigation for ships at sea and aircraft in the air.

recreational boats often did not have any such equipment until into the 1970's,
1980's and in some cases 1990's. Lots of recreational vessels were lost due to
hitting rocks in reduced visability conditions until lorans and later gps's
became common. Stories of vessels lost such were common in the boating
magazines until the late 1980's.

back in the 1920's, ships (and aircraft, at least some of them) had RDF,
specifically to avoid the dangers of DRing.

G Not everywhere, jax, and by this statement, we realize that this is
another
area you know little about.

Shen