Walker 4020 Mk2 is a compact EM Speed Log for smaller vessels which require a “Wheelmarked” MED Type Approved system in a minimal package reducing the size and number of sub-units required. This results in a smaller, lighter system which is simpler to install. The 4020 combines the electronics unit with the speed and distance indicator in one master unit which may be console or bracket mounted. High reliability sensors, flush fitting, fixed and retractable types housed in hull fittings suitable for various hull materials, such as aluminium alloy, steel, GRP and wood.