Using Ping Sonar Altimeter and Echosounder to measure distance to water surface

Blue Robotics Products Ping Sonar Devices
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Hi @OASimen,

As @ljlukis mentioned, a log of the profile data would be useful.

A couple of extra questions:

  1. Is your sonar in auto mode?
    • If it’s in manual mode and has been configured with a limited scan range then it may not be able to detect 18m away
  2. Do you know how upright the sonar is pointing?
    • If it’s at an angle then unless the sea is quite choppy it’s quite possible the sonar pulse will reflect off the water surface and away from the sonar, in which case it just never sees a return - there’s some additional explanation here