It is therefore important to correctly position the instrument in relation to the range of the beams in order to avoid errors in measurement. To solve these problems, Nortek AS has proposed current meters with different beam orientations that can be chosen when placing (made to order) according to the future use of the instrument: seabed mooring, mounting onto a ROV (remotely operated vehicle – see section 4.3), onto a buoy, near to the surface or bottom of the sea, in a canal, etc.