I would certainly hope so - if you were here, that would be easy to arrange. I hope that you will find the same in California.
I can see why surveyors would want an in-water survey for a complex custom build, to make sure that the vessel floats at her designed waterline, and that her stability meets the minimum requirements.
But I am sure that you have a pretty accurate estimate of her weight, and when you designed her I presume you would have calculated the displacement at the intended load waterline?
I think your existing dive boat is a similar size and shape, but it is an inflatable?
All else being equal, I would think that generally an inflatable with the same length and beam as your boat will have 'better' stability than your hull form.
Have you done any rough calculations re your stability?
If I was wearing your surveyor's hat I would want to go on a brief sea trial to see how she behaves, as she is very different from the 'average' 19' long planing motor boat.
What is the maximum number of divers that you will you be taking out spear fishing? And how will they be arranged in the boat while you are underway?
When leaving the boat I guess they would tumble backwards over the side in the usual fashion - would they come back on board over the side using a ladder, or over the stern?
Do you go diving with your clients, or do you always stay on top with the boat while they are underwater?
Yes, I weighed the bare hull at 610lbs, finished with just her 316 hardware/fittings she'll be 625lbs, and then 60hp engine, 18 gallons of gas, batteries, electronics and radar she'll likely weigh 1100lbs. She is very light for a 20' boat with all that but she is going to sit lower than I originally expected. She has a sort of rear well of about 1.5 cubic feet, 6" below her deck with big scuppers, and I now expect her to sit with her scuppers partly below waterline but not her deck. She should sit very level though in the harbor with just a smidge of drop in her rear. For this kind of vessel I'm fine with a swamping deck, it just gets more stable the lower she goes and there's no surprises if she onboards water. Underway she'll rise up and venturi forces should very quickly bail her, plus deck does have a little slope. A lot of the small RIBs now are built to partly swamp under their deck at rest for stability... for divers in wetsuits it's fine for me if the deck itself swamps a bit. It'll be cleaner of suit juice, fish guts and lobster pieces. I expect she'll rise to her chines at about 10-15kts. I built a scale model very early on, with not quite a full bow and no aft airboxes. For the model I most of her weight at her sheerline to create an absurdly high COG and she was okay like that so this'll be fine.
Yes, my existing inflatable is much smaller but very similar in that it's very long, narrow, and low to the water with high coefficient of waterline plane. A similarly shaped inflatable would possibly have similar or slightly better stability at rest, although her COG is very, very low by design, with fuel tank and batteries under the deck and even partly below the waterline. She isn't designed for standing operation but one thing about her being so narrow is that it's easy to always maintain 3 points of contact when traversing her in a crouch. Hull should have excellent level attitude and stability when underway (much better than an inflatable of this shape). Her chines are mostly 3.5" wide along her entire length, which is quite generous given a 4' beam, so I expect she'll ski firmly on those even at low speeds, and the rear airboxes--on the same plane as her chines--will act as enormous trim tabs without the drag.
Freedivers don't need to tumble over backwards, that's more of a scuba tanks thing. There's actually deep slots/handholds built into the gunwales on the port aft corner for boarding. If necessary I could drop a ladder into those but I expect it won't be needed--it'll be about a 13" heave and most any of my students being basically swimmers have at least that minimum fitness... In my business most client injuries happen when people are climbing in or out of the boat and small ladders are the worst for that. Either you want a very big boat with an enormous swim step platform at the waterline, or absurdly low sides so nobody can fall far. As for passengers I'm planing on small bean bags. They can be rearranged as best for weight and balance depending on the seas. Again, I need to sea trial her but I designed her for me + 3 passengers if used commercially--one person can very comfortably be fore of the console and two can ride aft... I have to do final calculations between the CAD model and build execution but below her deck she's got about 2000lbs displacement of unbilgeable air/foam and about 50lbs bilgeable, plus about 300lbs above the deckline, sealed airspace but draining to bilge. Electrical is fully sealed to above sheerline. The batteries are housed under the deck in small compartment... there's a secondary bilge pump in there but if any water at all is getting in there hatches were left open or boat is functionally sinking. With human cargo or fish she'll be awfully hard to sink even with a lot more than 4 people. Total hull displacement is roughly 5000lbs. I'm always in the water with students. My anchor systems are unorthodox, but I use a very heavy system and set/check it myself. For paying clients they're well vetted and I'm probably taking them to a spot where I have many hundreds of prior hours so I know the bottom like the back of my hand. This vessel isn't intended for chasing fish in true offshore blue water, at least with paying clients--it's designed to sprint to/from our islands and then anchor for diving.
