red
They are normally white buoys with a horizontal blue stripe.
yellow
They are anchored to the sea floor
Yes, it is illegal to climb on sea buoys as they are intended for navigation and safety purposes. Climbing on buoys can be dangerous for both the climber and for disrupting maritime operations. It is important to respect marine equipment and avoid climbing on them.
Mooring buoys are white with a blue horizontal band.
Red buoys have even numbers and red lights; green buoys have odd numbers and green lights.
They are normally white buoys with a horizontal blue stripe.
White with a blue band
they should be passed on your starboard side when going upstream
In the United States, when you are outbound for sea you would have red buoys (even numbered) on your port side(left) and green buoys on your starboard side (right). When returning fromsea you would have red buoys on your starboard (right) side (Remember " Red right return") and green buoys on your port side (left).
Some red buoys are known as "nun" buoys.(Ref: SB-4)some red buoys are known as nun buoys