Unity 4.0 iOS GPS Fix

Unity Engine
,
1

Hello,

I’m at Leaping Coyote (www.leapingcoyote.com) right now, working on an iOS game that uses GPS. It looks like a bug crept into Unity 4.0 that gives bad values for the GPS data. If you’re seeing the same thing, here is how to solve that:

open up iPhone_Sensors.mm
Look for the code that calls UnitySetLastLocation. Notice how the timestamp is the last parameter? It should actually be the first parameter. Here is the rewritten section:

// Delegate method from the CLLocationManagerDelegate protocol.
- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
		   fromLocation:(CLLocation *)oldLocation
{
	gLocationServiceStatus.locationStatus = kLocationServiceRunning;

	UnitySetLastLocation([newLocation.timestamp timeIntervalSince1970],
                         newLocation.coordinate.latitude,
						 newLocation.coordinate.longitude,
						 newLocation.altitude,
						 newLocation.horizontalAccuracy,
						 newLocation.verticalAccuracy);
}

Cheers.

2

Thank you so much for that! :slight_smile:

3

Hi, I have the same issue…I checke with the file but the timestamp is already at the right place…but I installed Unity 4 only yesterday so they fixed it maybe. Anyway I still have my GPS coordinates totally wrong :(, any other solution?

4

thank you so much for figuring this out! this was killing me. I could tell something was shifted because I was getting an expected longitude in the latitude parameter but never would have figured out what was off.

5

I confirm that this is fubar in the shipping version of 4.0.

6

Robin, are you sure you checked the calling code and not the code that defines the function?

7

Did the GPS bug get fixed

8

Yes, with Unity 4.0.1.