Satmap Active 10 Plus

£380 + £200 for 1:50,000 GB
Weight: 222g (inc batteries)
Size: 13×7.5x3cm
Battery life: 16 hours
Channels: 12
www.satmap.com

+ Easy to navigate; rugged and waterproof with a 3.5inch colour screen (largest on test); comes with carry case and useful in-car charger.
– Additional maps are expensive. Slower to fix a location than others tested. Start up instruction booklet inadequate. Bigger and heavier than others.

Verdict: Pricey package but it’s a good rugged unit with many impressive features, including navigating with external buttons and a joystick.