The same way it affects you when you're operating anything else, with maybe a little seasickness added to the mix.
Makes it more likely that you will have an accident
Not if you are operating the boat. You must be at anchor or docked. You can be charged with operating a boat under the influence.
0.08
all 3
The same way it does when you are driving a car
Slightly more when on a boat
Physical reactions become slower
Slightly more when on a boat
It varies from person-to-person. It can impair your vision - making you unaware of potential hazards in the water. It can reduce your inhibitions - making you do things you wouldn't normally do (eg swimming naked in a cold sea !)
Slightly more when on a boat
Slightly more when on a boat
Slightly more when on a boat