Zaryn, JoshB, thanks for your comments,
JoshB, you're right about the water moving too slowly, will add more movement if I get time, I have tried divx, qt-o2 and sorenson3, wmv. Divx was the smallest file output, but all effect the PS induced grain. Attached is a frame from the filtered version. The newsreel is set in 1911 and is to match still photos from that time. I also used the post effects in AM itself but the grain I feel looked better out of PS. The bounced light hitting the bottom of the boat is a good suggestion and the cut and paste observation pretty accurate because it is actually a photograph on a moving patch. With the grain added a lot of this detail is smoothed over.
Ian