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 RIO GRANDE Nov 10, 2017 10:17 UTC

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