Best underwater topography app

[fishfighter91]

I have been looking around to try and find an app for my smartphone that has accurate underwater topo maps of lakes here in Utah. I have purchased a few of the fish-n-map co but whenever I pull a gps coordinate from the map and input it into my phone or gps they show incorrect locations no matter what Datum I have selected. Does anyone have an app that they use that they really like?
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[treetop]

I got the navionics app fir my iPad. It covers all of the western us lakes.
Showers the under water contours and showers exactly where you are on the lake. Costs about $55 or so. Worth every penny.
They have a free trial you can download.
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[dtayboyz]

Navonics, I have this app for my iPhone. Love it! Costs 4.99 and is the same as my humminbird fish finders.
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[Moosedog]

I have Navionics also. It doesn't have all the lakes and as far as accuracy not so much at least at Flaming Gorge. It will get you close ish but it's off. You can see the lakes it covers online.
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