Raymarine L470 Operating Instructions, Bottom Conditions, Hard Sand Soft Mud, Rocks

Hard (Sand)

Soft (Mud)

Rocks

Fig. 3-6

Bottom

Conditions

reach through this layer, and may be reflected by a more solid layer below. It is also possible that the sound waves are making two complete trips – hitting the seabed, bouncing off of the bottom of the boat, then reflecting off the seabed again. This can happen if the water is shallow, the seabed is hard, or the sensitivity is set to a high value.

40 Operating Instructions