but, beware if you go back in bays or far in creeks, navionics don't have detail.

I bought navionics because of the high definition maps for some lakes in the 2007 hotmaps premum east. where data is available it is great, but I was a little dissappointed in the bays on barkley that had no (zero) depth info for them. Now the maps for other lakes that weren't in HD, were 5 foot contours and pretty decent.

One other word of caution is if you want to look at the maps on a computer, in order to do that with navionics, you have to pay an additional 129.00 to get a special card reader and software due to their chip being encrypted.

Depending on what you want out of it, it may be decided between navionics and lowrance hot spots maps.