A regular Elite 5DSI does not come with a micro sd lake map card, just an internal map that shows lakes as "blue colored areas" (though some lakes will have some contours shown, but in larger increments ... like 7ft -17ft - 27ft) It does have a waterproof card slot, which will take the blank 2GB micro sd cards .... or Navionics Hotmaps, Fishing Hot Spots maps, or Lowrance Insight maps cards.
The Elite 5DSI Gold model ... comes with the Navionics Gold map card ( as stated in the West Marine ad .... a special-issue custom 2GB Navionics Gold microSD card with coastal/offshore coverage of US and Canadian waters along with the Great Lakes, Alaska, Hawaii, the Bahamas and over 125 major Canadian lakes)
... cp