IMPORTANT GPX RECORDING NOTICE
BATTERY SAVER MIGHT TURN OF GPS
ANDROID EXAMPLE: If you have Android 6.0 and higher, battery optimization is used and Android system restrict apps running time in the background. When you turn off display while recording a track in GPX Viewer PRO it may not record anything or record only some points. In this case you need to turn off battery optimization and also turn off battery saver mode. Also please have a look at this website dontkillmyapp.com as it can help you resolving these problems too.
Greenify app can also kill GPX Viewer PRO while recording so you need to disable battery optimization in Greenify in order for recording to work properly while screen is off.
You can also use Memory Locker and GPS Locker when you still have issues with track recording. GPS Locker will ensure that when screen is off GPS signal won’t be lost so GPX Viewer PRO should record track properly.