Why do I want mapping options

Looking at getting a new Marcum MX7 or Helix7 ice unit. Just wondering why folks want the maps on thier ice units, to me it seems really awkward to use while traveling across the ice. I currently use a Helix 7 on my boat and have since mounted to my UTV as a dedicated GPS. I’ve always used navionics on my phone to find contours and locations to fish. I am missing something by not having mapping/GPS options on my flasher unit?

They are handy when driving out in your truck to your location on the ice,I have a helix on my four wheeler for gps but not one mounted in my truck. I like lake master more than navionics.

Would rather look at one on a seven inch screen than a 3-4 inch. Navi on phone is wildly inaccurate in many cases.