Not getting exact latitude longitude on ios device using watchPosition - react-native

Question

Issue Description::
I am working on react native tracking application. Basically users check in from a certain place and they need to reach at the destination. Using this application we are finding out the path they are following. I need to get a geocodes from users check in location to destination to track the path he is following.
Now it builds a clean path in case of Android device, but having an issue with ios. For ios it takes a huge variation inside code.
I have tested this by traveling to same place using both devices(ios and android). For Android it's generates a exact latitude longitude values, but for ios there is a huge variation. Why this is happening. I have followed the official doc of react native for geolocation setup.
You can check this link:: https://facebook.github.io/react-native/docs/geolocation.html#ios
We are using react native geolocation service package, GitHub link
This is happening when I have updated react native version to 0.58
Code::
this.watchId = Geolocation.watchPosition((response) => {
this.currentWatchLocationTimeout = this.currentWatchLocationTimeout + WATCH_LOCATION_TIMEOUT;
currentPosition.lat = this.convertToDecimalPoints(response.coords.latitude);
currentPosition.lng = this.convertToDecimalPoints(response.coords.longitude);
//... additional code
}, (error) => {
this.onGeolocationErrorOccurCallback(error);
}, {
enableHighAccuracy: true,
distanceFilter: 5,
showLocationDialog: true
});
Additional Information ::
React Native: 0.58
react-native-geolocation-service: 2.0.0
platform: ios(only)

Answer 1

Best solution that works for me is changes inside react native geolocation files. You need to replace some lines of code. Go inside react native package,
react-native/Libraries/Geolocation/RCTLocationObserver.m
Then replace this line::
#define RCT_DEFAULT_LOCATION_ACCURACY kCLLocationAccuracyHundredMeters
with this::
#define RCT_DEFAULT_LOCATION_ACCURACY 0.0
After this replace this line::
.accuracy = [RCTConvert BOOL:options[#"enableHighAccuracy"]] ? kCLLocationAccuracyBest : RCT_DEFAULT_LOCATION_ACCURACY,
with this one::
.accuracy = RCT_DEFAULT_LOCATION_ACCURACY,
You need to directly search for these lines on above mentioned path.
I found this inside git commits, you can also check this link:: link