The SAL R1a is an IMO type-approved speed log for measuring speed through water (STW). It includes bottom arrangements, transducer, and electronics unit, all mounted in the bow area. A digital speed and distance display is also included for bridge installation.

Acoustic Correlation
Acoustic correlation is a proven and practical technology that measures sonar readings across two elements in a single transducer. This technology measures water speed slightly further away from the hull than electromagnetic technology and doesn’t require the angular corrections of Doppler technology. This translates into less corrections required in the speed calculation algorithm, delivering stable and reliable speed through water measurements.

Easy Tank for Easy Installation
The SAL R1a’s “Easy Tank” bottom arrangement provides a closed ended installation, with no need for a watertight compartment or piping above the waterline. The watertight arrangement is damage-resistant, and a watertight cable enables installation in wet environments. Bottom arrangements are available to suit both aluminium and steel hull constructions.

The speed log’s electronics are enclosed in a splash-proof steel box, which can be mounted up to ten metres from the transducer. The remote bridge display connects to the electronics unit via an industry-standard IEC 61162-1/NMEA 0183® interface; the electronics unit also provides pulse and voltage outputs for connection to alternative display devices.