Android Question Current location from GPS different to google maps

[Albi]

Hello,

I'm comparing the (lat and long) coordinates from my current location based on the GPS tutorial with those from Google Maps (obtained via web browser). They differ a little so that the distanceTo a target (10 metres away) gives a distance returned of about 44km.

The formats differ slightly - my phone returns 12:34.567890 while Google maps gives 12.345678.
I assume that the google one is dd.mmssss to correspond to dd:mm.ssssss of the device and that this is not relevant.
If these formats are equivalent then the difference between them is 00:23.xxx for latitude and 00:08.xxx for longitude.
I did go outside to ensure accuracy.

If anyone knows what I'm doing wrong that would be great, thanks!

 

[Erel]

What is the output of Log(Location1.Latitude & " " & Location1.Longitude) ?

 

[Albi]

those logs give very close matches to the google maps results.
why would the bearingTo and distanceTo not work?

I changed the location sub to

Sub GPS_LocationChanged (Location1 As Location)
    lblLat.Text = "Lat = " & Location1.ConvertToMinutes(Location1.Latitude)
    lblLon.Text = "Lon = " & Location1.ConvertToMinutes(Location1.Longitude)
    lblSpeed.Text = "Speed = " & Location1.Speed
    Log(Location1.Latitude & " " & Location1.Longitude) 
    edtBearing.Text = "bearing: " & Round2(Location1.BearingTo(target1)+180,2) & " distance: " & Location1.DistanceTo(target1) & "m"
End Sub

I've added 180 to get a compass bearing from 0-360 instead of -180 to 180
I didn't think this would affect the result?

The only other change was in activity_create where I added

target1.Initialize2("12:34.5678", "-12:34.5678")

(with Dim target1 as Location in the globals sub)

 

[Albi]

aha, i have initialized the locations with latitude and longitude instead of minutes.

 

[Albi]

and if anyone else finds this thread, need to add 360 to the bearing if it's less than 0 since bearing is 0-180 for north to south and -180 to 0 for south to north (via west)

 

[Albi]

thanks for the help Erel. And I should stop replying to this now.