Just got this unit for Christmas. The mapping is worthless because it doesn’t have anything for KY Lake. It states it is compatible with two versions of Naviotics – Premium Hotmaps and Gold Charts. Is anyone familiar with these versions? The Hotmaps are cheaper because it’s only an East version. Yet, don’t fish anything lower than Dale Hollow. Recommendations?

Secondly, the transducer that comes with this unit only has up to 455khz frequency. Yet, I’m told Hummingbird has a trade in policy to get the upgraded transducer for an extra $90 which will go up to 800khz. Is this worth the extra $’s? I’m far from being an expert in this area, but want to be sure this is worth the extra $’s?

Would really appreciate your expertise.

Thanks and hope your holidays were grand!!