Probably the best free GPS on the market. After trying many GPS apps, I got frustrated with the confusing interfaces and poor odometer performance. You don't have to be an expert cartographer or experienced navigator to use this app. The interface is slick and intuitive and the data is accurate. The odometer doesn't lose accuracy at low speeds and is the best of any I've seen on a phone. I especially like the fact that my data is backed up so I won't lose my progress if I have to change battery. Great app. Thanks.