Howdy from Wyoming @Pieter Lubbe , welcome to the community, plenty of fine folk and excellent information here.
Hi there JeffHi Pieter, congrates on the new bird. You'll love it. In this order do this for your first time out: 1. Turn off the Cell portion of the phone(put in Airplane mode). Also turn off the WiFi. The only thing you want from the phone while flying is the screen and the phone's GPS. This is important I think for this reason: you don't want any updates until you've had reasonable flight time on this new bird. You will be able to know what's normal this way. Then if you choose to upgrade the firmware, you'll have a good feeling for what's normal and what changed during the firmware upgrade. There have been "fails" in some of the firmware upgrades. It's important to know if your quad was normal before the upgrade.
2. Don't take off right away, let the Mav have some "on" time so the GPS can grab a signal from as many satellites as possible. In Alaska, mine commonly has 16 to 18 sats.
3. Next, after it's been on but not flown yet, touch the screen of your phone near upper left edge where it says something like GPS MODE or ATTI MODE, (or search out where you do a compass calibration). Important since these were last calibrated in China, and Africa is a ways from there. You should see the deviation adjustments it makes to my compass when it first comes from China and then gets turned on in Alaska.
4. Wait for it to say "Home Point Has been Updated" VERY IMPORTANT. This is your "get out of jail free" card.
If all else fails, and communication is totally lost between the Control and the Mav, or if your phone glitches and shuts down the app, you can call the bird back to you by pressing the RTH button. Test this function when the quad is only a 100 ft away or so the first time you go out. Set the height of the RTH setting to clear anything in your area so it won't whack a tree on its way back to you.
Did I forget anything? Enjoy your MavPro, Jeff.