have just started using the nav. features on unit. notice there are no contour lines or lake outlines on any lakes. bought the premium card, thinking my lakes just weren't covered in the preload. still nothing. couple of buds said to check chart select and see what my setting are. i checked and don't even have that option on my unit. have i got something turned off or did i just get ripped off and don't have the mapping features. thanks.