One issue can come up if your hull
is too steep of a vee forward. I replaced my depth
finder with a new unit with airmar transducer. I bought the inside hull
mount which you fill with rv antifreeze
, but it only tolerates a certain hull angle. The minimum angle of my hull forward of midships is >30 degrees. Therefore I had to build a new housing. I used a 6 inch PVC pipe stub that I cut on a table saw to match the hull angle. Then glued it to inside of hull with screw cap lid, then filled with RV water
. Works great. Would have loved to epoxy
or siliconed it, but would have required a flat section somewhere.....