For all Underwater/Awash Rock features of depth 30 metres or less an instance of the information type Spatial Quality (see clause 25.4) must be associated to the rock point geometry, using the association Spatial Association.
The attribute display uncertainties is a cartographic attribute intended to reduce screen clutter in some ECDIS display settings by limiting the display of the horizontal position accuracies of a sounding to those considered by the encoder to be important to the mariner, and is mandatory for all Underwater/Awash Rock of depth 30 metres or less.
Underwater/Awash Rockfeatures of depth 30 metres or less an instance of the information typeSpatial Quality(see clause 25.4) must be associated to the rock point geometry, using the associationSpatial Association.display uncertaintiesis a cartographic attribute intended to reduce screen clutter in some ECDIS display settings by limiting the display of the horizontal position accuracies of a sounding to those considered by the encoder to be important to the mariner, and is mandatory for allUnderwater/Awash Rockof depth 30 metres or less.