When you see what's there within the US border, it's almost nothing but water.
Thanks for pointing this out, it's never been raised before. We're now looking into how best to tackle this so hopefully we can get it worked before the Twin Cities sectional updates in January.
That area, consisting primarily of Lake of the Woods, is the destination of many very serious fishermen.
The fact that that area is part of a published sectional chart should make it easy for iFly to stop truncating it out of their presentation. They don't chop off the bottom half of Florida just because it hangs out below the rest of the country.