The requested vessel with name SCHAARHOERN and MMSI:0 and IMO:5010323 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
SCHAARHOERN N/A 211227410 HAMBURG Jan 18, 2018 20:23 UTC

Also, you may try to find the vessel in our comprehensive Vessels Database or track this ship on the map.