Pipes are stored on the seabed. Depths above these pipes are less than indicated in the chart. Yellow spar buoys with X-topmark (Fl.Y.5s) mark outer limits for pipes stored on the seabed. The pipes are on the surface when they are moved.
The location of the stored pipes is often changed. Information about these changes, including positions on buoyage, is published in Danish Notices to Mariners.