Insight is the pre-packaged and pre-loaded TM for Lowrance, H'bird's are NVB. I think Navionics provides both, although I also understand the NVB is out of date by 2 years, so H'bird users should go for the card. Haven't heard the same on the Insight though, although it's only been out about 6 months or so and should be about as current as can be had.

Navionics makes maps for all units, but you have to get the specific card that will work in your unit....if there's a question, go to their site and look it up. Not all work with all units.

Wannabe...