Page 16 of 38
2021-06-24
CU-M001 User manual
Page E Depth
Depth is measured on the two main measurement beams of the system. These are tilted at 30 degrees from
vertical and will therefore measure in front of the sensor and to the side.
As the system does not measure vertically, there is a danger that the beam will be bent (refracted) in the wa-
ter as the water temperature (and therfore sound speed) changes. This is impossible to predict, and so there
will be some error in the system particularly in deeper water.
This system is therefore not approved to be used as the primary echo sounder for the vessel.
The average value takes the forward looking beam, and calulates the depth at that point and using the meas-
ured speeds predicts when that point is vertically under the vessel
The graphic on the left shows an echogram of the depth below the vessel. This graphic is unusual in that it
uses the speed to calulate where the displayed points are relative to the vessel. If the vessel sails backawards
the plot will grow to the right, if still all the points will congregate in front of the vessel. The calculated
depth directly below the sensor is shown as the depth.
The graphic on the right shows the individual beams depths adjusted to vertical depth.
Options: There are no options on this page, pressing the depth unit (default meters) will change the unit to
feet, or fathoms.
