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If my map card has to be in unit all times, how do I save 3D map to a card? How do I use the saved maps if navitronics map card is in reader?

thanks,
Todd

So here are some thoughts on 1st time usage. Unit locked up on me 3 times to start then flawless. Side imaging equal to my 898 humminbird but nowhere near new humminbird units. 3D view is really...