Simrad EQ60 - Manual (Page 20)

Simrad EQ60
8
857-164342 / Rev.C
The bottom detection algorithm locks to the first good bottom
return. The depth at point A rather than the depth along the
transducer axis will be output for a sloped bottom. The detected
depth value is always smaller than the depth along the
transducer axis implying that a safety margin is automatically
included.