Reported this to the Swedish Maritime Administration a few years ago and received the response that the shoal is within the dark blue 3 m area and therefore does not need to be marked on the nautical chart. These coordinates are taken on an elevation on the ice that may have shifted slightly from the shoal. The shoal consists of a rock tip. Many in Trosa have run aground on it. Even the Coast Guard a couple of years ago. Including myself.
Weather
Failed to fetch weather forecast data (HTTP 429).