Isolated danger buoys are placed directly above a hazard such as a submerged rock or a wreck, but has navigable water all around it. Unlike cardinal buoys, they can be passed either side.
- Horizontal Black & Red stripes
- Conical, Pillar, Spar
- Top Marks
- Two black balls in a vertical line
- White, 2 quick flashes with intervals of 5 seconds
- Chart Symbol