I have a Coospo I use and they work just fine if you don't need a map in front of you. I use their speed sensors and strap on HRM as well. They have an app that you can pair it with on your phone but I don't use that since I have a Garmin Epix Gen2 I wear and use that to track metrics. But when I compare the HR and speed and distance data from the Garmin to the Coospo it compares very favorably. So I use the Coospo in the cockpit so I have good at a glance data. Battery life on the Coospo is decent for what you pay. I'm getting probably 25-30 hrs real time use before I charge and I don't run it all the way down but let it get close.