Lakemaps question

My biggest downfall is a lack of full use of my electronics. That being said I am in need of some updated lake maps. Currently I have navionics hot maps in both units on my boat. Both cards are a few years old and do not have some of the current mapping. Does anybody know if I can update the cards to get the most current t info or will I just have to get new cards? Thanks again for the info yall.

New isn't always better. I had an old Navionics card from nearly 10 years ago. Then I got a new Lowrance and purchased a new hotmaps card. It had less mapping info than my old card. Example - the Decatur flats showed blank on the new card, whereas my old card had all the contours on it.