So I take it that you only used the GPS on occasion to verify your chart
plot and rightly considered a cross track [drift] error of one mile in 20 as
not worth concern as long as you knew where you would be on arrival to
corrected waypoint?

Actually, some dumb behavior on my part. I failed to put fresh batteries aboard
for the the GPS and left the new power cable home. I was "spot" using the GPS
by Sunday and I even failed to buy batteries at port jeff!
Yes, the small drift was just not a factor over such a short distance. The most
I know about the Sound's bottom is that taking more "near coastal" tracks can
ease current woes. On the other hand, I was expecting wind direction changes
and I wanted more course options afforded by being in the center of the sound.

RB