Thanks to you all I am now more enlightened and on my way to being a transmission specialist

. Today I took pictures and figured out more about the transmission (a much neglected part of my 1 yr ownership of this boat). It turns out to be a Kanzaki KM3-A based on the plaque on the back and out of sight until today with a mirror and camera. It helpfully lists the oil requirement as SAE 20/30 HD. @ .3 Liters.
I was alarmed to recall that the boat came with a bottle of ATF transmission oil and realize that most likely it was filled with the wrong oil. I used a revised version of your helpful paper towel technique and came up with these results (see image).
"Trans Sample" was a little off color, but suspiciously similar to the "Fresh ATF" sample. It certainly did not look like the "Engine Sample (SAE30)" or "Fresh SAE 30".
Now I know that I need to extract the ATF oil and replace with .3L of SAE 30 HD. Also I now know how to read the dipstick... which is where this started. Isn't that just like sailboats? To start one place, take a circuitous route and end up some place you didn't quite expect?
Thank you for all of the helpful help.