If you get unlimited data google maps is really good. I've used it driving wagons and been spot on.

App wise nav free is also pretty good. Uses google for searching if needed. Sometimes tells you to go round a roundabout as if we drive on the right but again, one I have used personally while driving wagons and didn't let me down.

Mainly use a proper gps though but was testing them for my self in case of sat nav break down and had to use my phone apps.