It's actually above budget at £120 but currently sits at £87 on Amazon. The Garmin Drive 51 LMT-S is a simple, straightforward yet still feature-filled sat nav system that comes with lifetime mapping updates. It can be paired to a smartphone to enable extra features including TripAdvisor ratings for points of interest, plus it provides live traffic and live parking information. Pairing up a smartphone doesn’t enable handsfree calling, though, nor can you plan routes within your smartphone and send them to the Garmin - which we'd argue is the biggest shortcoming. However, for a dedicated sat nav under £100, we think it's a great option.