Fresh from a very nice US user. Thanks!

Absolutely essential for professional observational astronomers ★★★★★
by GrantTremblay - Version - 1.4.2 - Aug 18, 2015
If you’re a frequent observer, this is an absolute must-have. I have made many observing runs using this app, and it simplifies the planning of a night by orders of magnitude (particularly if you’re observing many targets in a run).