Im sorry if I hijacked this thread, I was just trying to save members some money. AS far as high-def I guess I wouldnt know the difference. I do know these maps are every much as good or better than all the paper maps I have. This Dvd just allows you to do way more than what you can do with paper maps. Ive got a Lowrance hotspots card in my my Lowrance unit and this is ever bit as good as that. Except I cant bring in my Lowrance and study it in my living room..Hey, what can I say i like this product,just my opinion...... Greg