Salt or fresh water??
The 2 long bolts.
One is a tilt/ pivot bolt.
This has been greased and "might" come out???
Part of this bolt is exposed and possibly corroded and might need cleaning to get loose.
The bottom "lower tilt shaft" will probably not be easy if it comes out at all.
You'll probably need a torch and a hammer and brass drifts to knock the bolts out.
Why take it apart??