Eight of the best handheld GPS units - Sailing Today
Garmin 010-01504-00 GPS 73 Marine handheld GPS that floats with SailAssist #60020280
2.6in Color Display GPS Navigator, Outdoor Handheld GPS Car Navigator for Vehicle Marine, High Sensitivity Receiver, Visual and Alerts (Black) : Amazon.co.uk: Sports & Outdoors
Eight of the best handheld GPS units - Sailing Today
Marine Handheld GPS Units & Accessories | Force 4 Chandlery