#1 Geonav 3

This is a mobile phone-sized set and despite its small screen size it’s very clear. Single-handed operation very easy, even when mounted in it’s charging cradle.

Constructing a route is simplicity itself. Follow it on the chart display or the highway display – you can select which windows you display from the set-up menu. Tidal current and tidal curves can be shown, the latter either the nearest or any you choose.

#2 Raymarine RC400

Although not really a hand-held in the accepted sense, this unit can comfortably be used in the hand although it’s much bulkier and heavier than many under test. The up side is the large screen, the size and spacing of the keys, and a logical interface.

#3 Garmin Nuvi 550

The Nuvi 550 is a mid-range in-car navigator which also has marine capability, having the same waterproof rating as the other sets on test. It isn’t designed to be hand-held, although it is possible to hold it in one hand and operate the touch screen with other. The touch screen and its menu work well and the maps across the screen.

Garmin GPSmap 276C

Magellan Triton 2000

Airo A25