Humminbird update v6.010

[Jim-G]

I've just registerd My new fishfinder (586c hd).Humminbird website shows an update available. Does anyone know what this update entails ?? I don't have the PC cord but the lady at humminbird said I could purchase one for $40.00 from them, if the update is not needed I will wait before buying this cord.. TKS[]
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