On Mon, 28 Sep 2009 09:39:08 +0200, Marc Heusser
d wrote:

In article ,
"Denis M" wrote:

After this summer cruise I concluded that I needed to replace my radar
reflector.

An active one will work wonders.
And (active) AIS is an even better option, provided you are aware that
only vessels over 500 tons are mandatorily fitted with one. This will
even give you the equivalent of MARPA.

HTH

Marc

Those big boats can (and do) filter out all signals from AIS-B
transponders to reduce clutter on their display. You may see them, but
they still don't see you.