I had a porta potty on my last boat, great when I went around the French canals, I took the 'receptor tank' to a public toilet and emptied it down the loo, I also took a container so after emptying I could put some water in to flush it out.
I used the blue chemical, it didn't need much, but if...
Y10 from F4 £17.50
Oxalic Acid - Boat Cleaner £10.74
Harpic Tesco £1.50
I was given the Harpic tip 25 years ago, I've never looked back and thought I wish I had bought something more expensive 🤑
Oxalic acid is the thing, but it's a bit of a faff getting it, mixing it and storing it, where as Harpic does the same job, easily sourced, cheap, easy to store and easy to apply - neat on a cloth or sponge. It doesn't look like it has done anything but after about ten minutes the brown stain...
You're 'supposed' to be allowed to tie up on the quay for 3hrs free of charge (there's a designated area next to the trip boats) but the marina staff try to discourage you and send you to the marina and pay for 4hrs short stay!
This was negotiated when the marina was built, but it's difficult /...
. . . to get a feel for the turning circle, both ways.
How long it takes to come to a stop (no tidal current) after you put the engine in neutral from tick over speed and normal running revs.
What your Speed Over Ground is at different revs. You will need a GPS app for this, something like...
From how you describe it, I would unscrew the nuts underneath but leave them at the end of the thread, then tap the bolts up with a hammer, each bolt a bit at a time. When you can't tap up any more, take off nuts and prize the assembly out.
Re assembly - leave bolts in place and tap down on a...
Speakers are a common source of magnetic field. You need to turn off / move each electronic device in turn and look at any deviation change +/- . It's quite a job, as it should be done on different headings, then decide what to do about the worst offenders.
In your favour is you can put the boat...
Is there onshore secure storage to keep a hard dinghy on site?
If not, then use your small inflatable to get to mooring to pick up the boat then bring boat into pontoon to pick up crew and bags.
Your choice then, depending on your planned trip, whether to leave inflatable on mooring, tow or...