One of my amateur radio friends sent me this over the weekend:

Thought you would get a kick out of this. In the early-mid 70s I was the US representative for one Donald Crowhurst. It was incredible. Crowhurst was driven, driven, driven........ by a desire to make lots of dough and be famous............ hence his trimaran thing. But he was a really super EE and his handheld LF RDF was way ahead of the competition. Even had Murata filters! I still have a couple left and it still looks like something out of the 23d century.

In those days I was in the electronic instrument business (mostly export/import of scientific equipment) but being involved with boats I couldn't resist trying to do something with this. I knew all the competition (the other handheld units, there were various ones as you know) and for a while it was pretty cool stuff.

For a couple of years I sold those gadgets at boat shows, etc.etc. and it was a gas. It came with WW2 surplus RAF waterproof khaki headphones with large rubber flaps, REALLY waterproof, and they made ya look like something out of "Guns of Navarone"

From the January 1970 "Sailing Industry"