Hi Egmont,
I found out the server timout must be 45 seconds, or it will not work 100%.
(i think now it is working 100%)
Tomorrow i will uninstall the app and start over and see if it will work 1 one go.
Today i did some testing with other applications with GPS.
i have app to warn me for speedcamera's - both your app and Flitsmeister were crashed.
Could be my misstake i changed the server timeout afterwards and did not check now.
Indeed the radius must not be too little 150 mtr is ok i think keep you updated.
Yes i will update the domoticz wiki