The requested vessel with name OCEAN CHILD and MMSI:503620800 and IMO:0 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
OCEAN CHILD ONE N/A 503705500 Oct 12, 2017 04:31 UTC

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