Sciatrope is an app made by an eclipse chaser for eclipse chasers. It helps preparing for, and observe, any solar eclipse.
It gives the eclipse circumstances, distance and direction to the central line. Observing location is, provided by the macOS location services by default, or an external GPS device compatible with the NMEA protocol.
Updated on Aug 11 2017
Note: Now requires OS X 10.11 or later running on a 64-bit Intel processor