GcCalc app for iPhone and iPad

An accurate Great Circle calculator for the WGS84 ellipsoid.

Using algorithms of Thaddeus Vincenty which are capable of providing results accurate to 1mm.

The "Direct" method calculates the destination location given a start location, bearing and distance.

The "Inverse" method calculates the distance and bearing between two locations.

Locations can be entered and displayed in: decimal degrees; degrees and decimal minutes; or degrees, minutes and decimal seconds.

The current location can be entered into any of the location fields using a single key press.

Distance units can be entered and displayed in: metres; kilometres; statute miles; or nautical miles.

The algorithms are based on scripts provided at http:/www.movable-type.co.uk (c)2002-2012 Chris Veness.