Ayuh,..... What I see is an ole transducer epoxied to the hull for a shoot-thru,.....
'n the black plastic is a bilge pump base, probably screwed to the piece of wood, glassed in for just that reason,....
A bilge pump pad,....
LOL - that photo is a lot tighter in than I took it for! Fortunately Bondo has a better sense of scale than I doSorry for the poor picture quality. You would think with as much money as you spend on an Ipad it could take better pictures. When I take the pictures with my phone they are too large for the site to upload, but they sure are clear lol