Reportedly built 1993, but not found where or for whom.
ENI 06002680, c/s OT3610, MMSI 215361090
As LADY-D was a bunkering tanker at Zeebrugge from 1997, with Dobbelaere Bunkers NV, then Drageda Bunkers NV
"Y D" looks like a temporary AIS crew entry.
LADY-D sold earlier this year to VeBo Nautical Services (Multratug Group), Terneuzen and renamed AQUANAUTIC under NLD flag - see https://www.shipspotting.com/photos/3602424
Suspect that she is being converted to a freshwater tanker, and will of course get new c/s and MMSI

Now named Y D?
https://www.marinetraffic.com/en/ais/details/ships/shipid:112056/mmsi:205361090/imo:0/vessel:Y_D