The cheapest way out of this is to download the navionics app on your smart phone or tablet. Beware. This app will eat at your battery quickly.
Most decent fishfinders these days have the ability to install the navionics chip and be a permanent fixture in your boat. This could cost you anywhere between $500 - $1500+ installed. Depending on how handy you are. Keep an eye out for sales at walmart.com and at Bass Pro Shop. They typically have very good sales for higher end units that are being replaced by a new model.
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