As usual you are 100% correct Trevor.
I however must confess that I don't give a hoot about dredging, survey, archaeology etc.
All I care about is how sonar, bathymetry and sidescan mosaics can help me and my readers catch more fish.
Hence the name of my books 'Fisherman's Guide to ...'
I apologise if I seem to be coming across a bit blunt, but I cannot pretend that I'm anything other than what I am - A Fisherman.
I don't mean to offend.
John Easton - Fisherman's Guide to Sonar
www.fishtec.co.za