BU-353 = GPS Receiver
Maps = Software that use GPS Receiver for position
Neither are dependant on the other. You can use that receiver or a pharos unit, or a bunch of other units that output NEMA info.
So you need to buy GPS software such as iNav's iGuidance, or Microsoft's Streets & Trips, or Destinator, or Map Monkey, or a bunch of others.
Usually $50 to $200



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