Thanks to everybody for your comments which are much appreciated, John's re-post is wonderful and works very well. I will give this method a try, thanks for that John
Art,
This was only my second only sighting of these birds, we saw two the previous day but virtually totally obscured by reeds. This one was certainly confident and stayed near the boat at the waters edge for around 50 minutes, there was a youngster further back in the reeds so it might have been protecting it. There are quite a few Shoebills in the area but no permanent boats operating, a great business opportunity for somebody I think.