I am trying to derive a DR fix from an initialized CLLocation.

Like this. (Playground)

let fixTime = NSDate(timeInterval: (1.00 * 60.00 * 60.00  * -1.00), sinceDate: 
NSDate()) // one hour ago
let fixLocation = CLLocation(coordinate: 
CLLocationCoordinate2DMake(boatLocation.coordinate.latitude, 
boatLocation.coordinate.longitude), altitude: 0.00, horizontalAccuracy: 0.00, 
verticalAccuracy: 0.00,course: heading, speed: knots * 0.51444445,  timestamp: 
fixTime)  // location one hour ago


I am sure there must be something like…..


let drLocation = fixLocation.advanceBySomeArbitraryTime(arbitraryTime)
But, this has eluded me so far. Any help would be welcome.
Thank you.


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