iNadcon™ - NAD27 / NAD83 converter for iPhone.
Latitude valid formats: "Decimal" (ex. '38.889139') or"Degrees Minutes Seconds" (ex. '38 53 20.9 N')
Longitude valid formats: "Decimal" (ex. '-77.049') or"Degrees Minutes Seconds" (ex. '77 2 56.4 W')
Great circle distance and bearing calculation
Destination calculation
Latitude/longitude conversion between DMS and decimal formats