Garmin makes chips for North America that will have Winni on them. I had a Garmin GPS Map a few years ago, I think it was a 180, and I bought the chip from a catalog......maybe BoatUS. At the time, the price was $90. I don't know if any other chips will work. I don't know if Bizer has a chip either. The Garmin chip was excellent, although it did show a small island off the northern end of Rattlesnake that isn't there. I even called Garmin about it, but they blamed the programmer.
Your unit, if it was like mine, has the highway system already in it. When I first got mine, I rigged up an antenna mast out of a broomstick and clamped it to the bed of my truck. I powered the GPS Map with a cigar lighter adapter and propped the GPS up on my dashboard. I had a ball driving around. It had great detail, even on podunk two lane roads that were very small on a map. Once the chip arrived, the unit went in my boat for good.
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