Anything deemed navigable OR any stretch of water with any influence of high tide you must have CG licensing to run for hire under any sort of power.

Learned a lot about this when we started using electric troller motors in tidewater and AK and we had to sit down with the CG and see what was applicable ... they weren't even sure there. Needless to say I'm now a certified USCG Captain of a MIGHTY 21 foot drifter powered by a 74 lb. thrust electric troller motor

Since I believe that our requirements for guiding in this state are too lax anyhow and I'm not much of one to watch illegal activities, I'm gonna let this post stand and we'll let Don put in his comments on this matter.