When approaching a spar buoy that is white with a black top?

When approaching a spar buoy that is white with a black top, you should recognize it as a special buoy, which indicates a safe water marker or an area to avoid. Typically, these buoys are used to mark channels or provide information regarding navigational hazards. As you approach, ensure you maintain a safe distance and be aware of any local navigation rules or guidelines that apply to the area. Always keep a lookout for any other navigational aids or signals nearby.