Ahh OK Thanks
Slightly higher then I thought...
See there are some inland boats that sail on this canal and under these bridges in Dunkerque:
http://maps.google.co.uk/?ll=51.034723,2.365172&spn=0.001155,0.00284&t=h&z=19&vpsrc=6&layer=c&cbll=51.034665,2.365373&panoid=eYjeKLAy99O5uM2Ug4-UiQ&cbp=12,284.52,,0,6.54
You can see them here:
http://maps.google.co.uk/?ll=51.033362,2.363644&spn=0.000581,0.00142&t=h&z=20&vpsrc=6
I was hoping she would fit too... well you never know
Thanks again