The device fulfills its purpose certainly when it comes to accurate tracking, if you load the tool for PC and there manually over to 10Hz. Then, the position is also recorded very quickly. Per BT pairing with Android mobile phone and matching APP, the signal be tapped properly. In order for a fairly accurate comparison of the reception quality of the built-in phone and Qstar was possible. Result was that there is something better and of course, the smartphone battery is significantly geschon. But since I've been using it primarily for Geocaching and only there need exact possible values, the difference for me personally proved too low.
