The requested vessel with name MARITIME CHALLENGER and MMSI:0 and IMO:7210446 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
MARITIME CHALLENGER 9766932 563024300 NOUAKCHOTT Feb 08, 2018 06:07 UTC

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