Has anyone passed under Rochester bridge with a downvision/structure scan imager?

[Murv]

A very long shot I know...
I have a Raymarine with downvision which is siliconed into the bilge. I know you're not supposed to with these, but it seems to work fine, but I don't see any detail passing over the old bridge so just wondering if I'm missing out on performance. Anyone know how mush detail you're supposed to be able to see passing over the old submerged bridge?

 

[oldgit]

A very long shot I know...
I have a Raymarine with downvision which is siliconed into the bilge. I know you're not supposed to with these, but it seems to work fine, but I don't see any detail passing over the old bridge so just wondering if I'm missing out on performance. Anyone know how mush detail you're supposed to be able to see passing over the old submerged bridge?

In the RCC clubhouse on the notice board next to front entrance there is an A2 map printed out from the recent hydrographic survey around Rochester Bridge recently carried out by
Thames Surveyor.
On my Raymarine fishfinder there is an easily identifiable profile of the foundations of the old bridge which blown up by the RE around 1850.Just next to it is pronounced hole caused by the scouring action of the tide.It should be difficult to miss.

 

[Murv]

Thanks Fred, it certainly shows up the contours, and the ledge, but I'm just wondering if I'm not getting the full picture (sorry)
This is the sort of imaging it's supposed to be capable of: