Hi,
I was wondering if there are any boaters out there that still use one.
Mine is still working fine and I use it every once in a while in the
fog. I would really like to find an instruction book for it. I know
it was made by Dodge Morgan's
(American Promise circumnavigation) company Controlonics probably in
the mid 70's. I expect that Apelco's LCD
radar for about the same money caused the Whistler to disappear from the
market. I was researching on the web about
Gunn Oscillators and came up with all kinds of stuff but nothing on a
Google search mentions this unit.

I can be reached at if there is anyone interested in a
discussion about this radar.
cheers john