"Humminbird AutoChart Zero Lines Map Card Brand New, The Humminbird AutoChart Zero Lines Map Card is 32 GB SD card containing zero lines for with over 140, 000 named water bodies and over 1.75 million unnamed water bodies in the United States and over 96, 000 named water bodies and over 3.85 million unnamed water bodies in Canada
Also there is 16 GB of free space to maintain your custom. The card must be present to get the detailed zero line base map to display in AutoChart PC. All of the Humminbird units will require software update. 600033-1 Features: AutoChart Zero Lines Map Card, Contours for Many Lakes, i-Pilot Link Compatible, Easy to Read Contours, Depth Highlight Range, Water Level Offset, Shallow Water Highlight, Depth Colors"