In the area N of Hestehoved Dyb and E of Nyt Løb, the depths shown in the chart originate from older surveys. 
Using ortoimagery, it has been established that significant sanding has led to shallower depths in the area than the survey indicates. 
This applies particularly to the shoals Ny-Tolk, Tolkebarren and Gammel-Tolk. When sailing past these shoals, vessels should stay outside the 4 m depth curves.