The unit accepts MMC/SD cards.
From the Operations Manual "...numerous mapping options, including support for Navionics Platinum, Gold, HotMaps and high definition Fish'n chip electronic charts"
From the Lowrance web site, HDS 5 page, "Optional Navionics® Platinum+ and Platinum chartcards with TurboView™ for worldwide coverage - as well as Navionics® HotMaps™ Platinum, Lowrance Hot Spots® PRO and LakeMaster® ProMaps* (Americas)"
Whether it will accept other mapping cards I cannot say, others may know?
I use a Navionics Gold card.
Dust creation specialist