There is a good explanation of the differences on the Lowrance site. click the HDS units, scroll down to discover more, click High Def mapping, learn more. <*)}}}><
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There is a good explanation of the differences on the Lowrance site. click the HDS units, scroll down to discover more, click High Def mapping, learn more. <*)}}}><
You'll see the difference,,,on the end of your line! PROUD MEMBER OF TEAM GEEZER