Upgrade your car's satnav and sound systems for better entertainment

Apple Carplay and Android Auto should be integrated in one device, because then many smartphone functions can be used via the radio. – Zacharie Scheurer/dpa

When it comes to cars, the entertainment system is usually the first to show signs of ageing: The display feels too small, and somehow the sound isn't as good anymore – what better time to get a retrofit?

Hardly any other part of a vehicle ages as fast as its entertainment system. A glance at the radio can usually tell you just how old a car really is – unless, of course, it's been retrofitted.