Ah! It's a great day, especially when I find out the problem was not mine
but a wiring error (or documentation error) on the DATA connector on the
back of the unit..

The manual shows DATA SIGNAL on pin #4 and DATA SIGNAL RETURN on pin #5.

As Wired: DATA SIGNAL is actually on pin #2 and DATA SIGNAL RETURN on pin
#3..

I also verified that both the connector and plugs have pin markings that
match up.. I think this was a documentation error..

BTW. The main reason I didn't intiate pin swaping earlier is because pin #6
of this DATA connector, for some strange reason, has 12vdc on it... That I
verified early on and insulated the lug on in the DIN back shell..

The radar now has a compass sensor heading so I can do a little more with on
screen plotting without manually computing the Mag. ships heading.. There
are also some tricks I can perform with the Yeoman, like place lolly-pop
markers on Nav Aids before the radar actually can pick them up.. (then
again, short handed sailing, I never have time to do anything fancy at the
chart table..)

Thanks again to those who responded.

Steve
s/v Good Intentions