globinskih sond, ki delujejo navpično pod aparatom, razen izvajanja skenirnih funkcij, ki presegajo ± 20 °, in katerih delovanje je omejeno na merjenje globine vode, oddaljenosti potopljenih ali zakopanih predmetov ali na iskanje ribjih jat;
Depth sounders operating vertically below the apparatus, not including a scanning junction exceeding ±20°, and limited to measuring the depth of water, the distance of submerged or buried objects or fish finding;