No. You can get a number of apps for phones which take advantage of the positioning tech to calculate where you are and help show you a live map of the stars – essentially a kind of AR. Apps like GoSkyWatch Planetarium or Star Finder can be a useful tool for astrophotographers too, but the 'star trackers' listed above are devices to help keep the camera pointed at the stars even as the earth rotates so you can keep the shutter open a very long time.