I am using a Custom Location under Debug --> Location --> Custom Location
While this setting does work just fine for me, the simulator frequently changes my setting from Custom Location to None. This reverting does not appear to have a pattern as I may run the same project 5 or 10 times without the setting reverting. Other times it changes the Location to None every 1 or 2 times I run the simulator.
Is there a way to lock the setting in so I do not have to fight with it?
The accepted answer it is a solution, solved your problem, but for other developers that are facing this issue, there is also a easier solution where you don't need a GPX file or to select one of the locations provided as default:
Now the simulator will keep this as default location. Actually the Allow Location Simulation on Xcode, together with the option none is the reason for "forgetting" the location you added before.
From now on, your simulator will always remember the last custom location!
Have you tried setting a default location? May be it is set to none.
Edit your scheme > Select "Run XXXX.app / Debug" > Select "Allow Location Simulation" and select a default location.