What is IMO Performance standard of Echo Sounder ?

• Means should be available to display the depths from the different transducers separately; and
• A clear indication of the transducer(s) in use should be provided.

Data storage: It should be possible to record on paper recording or other means the information about:

the depth(s), and the associated time for 12 h.

Accuracy of measurement: Based on a sound speed in water of 1,500 m/s, the tolerance of the indicated depth should be either:

• ± 0.5 m on the 20 m range scale, respectively ± 5 m on the 200 m range scale; or
• ± 2.5% of the indicated depth, whichever is greater. 

 Discrimination: The scale of display should not be smaller than 5.0 mm per meter depth on the shallow range scale and 0.5 mm per meter depth on the deep range scale.

Malfunctions, alarms and indications: –