I have been shopping for a small unit with basic telemetry (ie. speed, distance, time) for my Mtn bike. I initally went down the Internet search rabbit hole. And then experimented with Android Apps, for my Samsung Note 8, and found that I favor the Wahoo interface. I also compared it to Map My Fitness. Apps works well if you are able to acquire and connect to satelittes. Yesterday, I got what I wanted, with clear skies but prior day with cloudy skies and dense tree covering, was a no contact. I double checked with my geochaching GPS and it was off by 400 ft. I say all that to share that I settled on the Wahoo Mini w/speed sensor, for price and features that were important to me. I will carry my phone for the navigation features. If I need more in the future, I may consider the Wahoo Bolt. Hope this helps.