None of the HB units come with built in mapping with 1ft contours ...

5 and 7 inch units come with built in Unimap - which is Lake outlines only ..

9, 10, and 12 inch units (and ONIX and SOLIX) come with built in Contour XD - which is a limited amount of lakes with 5-10ft contours ...

You will need a map card for 1ft contours in any HB unit ...

Rickie