The application is really simple software. Acquire your location with GPS or enter your coordinates manually. Then, select a comet of your interest and watch its data, which includes rise, set, transit, altitude, azimuth, hour angle, ephemerides and the orbital elements used for the calculation.
Data is updated every 5 seconds. An image (artist's concept) of a comet shows the position angle of the tail. Length and brightness cannot be predicted with sufficient confidence. Tap on the image to toggle equatorial and horizontal views.
Comet Watcher operates in both, portrait and landscape modes. It is designed in particular for small phones running Android 2 and lower and comes with a WIDGET since version 1.17!
A more detailed and powerful comet application is available as 'Comet Monitor' for Android 2 and higher. For tablets, please look for 'Comet Monitor'.