The requested vessel with name EMERALD C and MMSI:0 and IMO:5306370 is temporary not in our database.
Perhaps you mean one of the following ships:

Vessel name IMO MMSI In range Destination Last report
EMERALD C N/A 367521680 Feb 20, 2018 19:57 UTC
EMERALD CITY N/A 367761160 Dec 01, 2017 19:05 UTC
EMERALD COAST N/A 367097920 NEW YORK Feb 20, 2018 20:31 UTC
EMERALD CORAL 9334997 548735000 PH SFS Feb 02, 2018 06:49 UTC

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