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got it to work is there a way i can overlay a map of the hunting land on my topo i can get the map off of the dnr website wha should i save it as? and how do i layer it on?

i am brand new to creating maps i have a garmin astro 220 unit basically 60csx unit i downloaded the michigan northeast topo map part one its all .img and i want to know how to get it on my map source so i can upload it on my unit and is there a way to create or get city navigator??