What device do you recommend I install the app on?

Our app works on iPhone / iPad devices (minimum iOS 11 - iOS 13 or + is recommended) and Android smartphones / tablets (minimum Android 5.0 - Android 8.0 or + is recommended) with a GPS (Caution: wifi iPads do not have a GPS).

• There are some originally relatively hardened / waterproof devices.
  
  for example, the Crosscall brand markets some: https://www.crosscall.com/en_GB/mobiles/smartphones/
  
  but other brands also offer some.
  
• You can buy a non-hardened device and then place it in a suitable protective shell if you wish, in particular:
  
  Otterbox: https://www.otterbox.fr/
  
  Gumdrop : http://www.gumdropcases.com/
  
  Griffin Survivor: https://griffintechnology.com/intl/collections/survivor

When purchasing a device, you should find out (on the Internet, etc.) about the quality of the device's GPS receiver and prefer a device with long battery life (GPS apps use a lot of battery).

Waterproofing is also an advantage for use in adverse weather conditions.

Although we test our app on a large number of devices, unfortunately we cannot guarantee that our app will work optimally on a particular device. Thank you for your understanding.