bluesky the elite 5 comes with a chip, so that is the one I'm using. Doesn't have 1 foot contours but I'm happy with the unit. Having said that, I'm not a techie guy at all, so pretty much any unit likely would have made me happy (except the humminbird one that says you're going 2.3 mph while in the garage!). For me and my low expectations it was all about cost, I wanted to keep cost around $500 and I was able to do that. The HDS was a bit more money, plus you had to buy the chip still (150.00??) so I never really considered it.