Re: bimini nav light
Every boat in this size range must be equipped with an all-around white light. Where it must be located I would need to look up. I used to have all of this stuff memorized. From a practical stand-point, it should simply be able to be seen from any direction while under way or at anchor at night. Additionally, it should be located near the back of the boat so you can see the length and proporations of the boat based on the location of the white light and the starboard and port lights.
I would think that if the light is on the front of the bimini, but still near the back end of the boat, it is probably fine. It may even be legal if it is in the dead center of the boat for that matter too.
Again, I used to know all this stuff. I attended navigation training when in the US Navy and was qualified OOD, but that was in the mid-90's.