Understanding the instructions isn't necessarily helped by the 930 T's built-in speaker, which can sound distorted at times.

The other annoyance is the night time illumination feature. Like all other TomTom devices, the GO 930 T is supposed to automatically switch to a night time map whenever you switch on your car lights.

It does this by measuring the amount of ambient light using a day / night sensor. However this didn't work at all in our test car. We suspect that recent builds of the TomTom GO software may be to blame. We discovered the same problem afflicted our ancient TomTom GO 700 after a software update. It worked perfectly before.

However these are minor niggles. The GO 930 T is easily one of the most accomplished satnavs TomTom has made and with genuinely useful features like IQ Routes, it's proved it can still innovate and stay ahead of the pack.