If you want to know where a sat is you cant go wrong with this app. Easy to use, plenty of options without being bloated and extremely nice looking. As an amateur radio operator it is missing one MAJOR thing. Up and downlink frequencies for the amateur radio satellites. Would be much more convenient and useful for radio communication use with those added. Even if there were an option to add your own frequency or note to a sat would be helpful. Cant give it a 5 due to that omission.