Thanks.  I've started using a GoPro H12 camera which is set to wide-angle but removes any fish-eye - seems more like it is when you are there.   Only issue is it flattens the image vertically (look at the duct).   However, the stability of the video (and the focal range) is very impressive (I need to keep the front of the craft out of the shot though to avoid the bouncing!).

This is a really god video and seems more true to life without a music soundtrack

15min of video trundling around Loch Fyne.

https://www.youtube.com/watch?v=eMqhlL8k2ls