Bottom Discrimination BDS 

Bottom discrimination provides detailed information about knowing the make-up of the seabed, categorizing it into four different categories; “Rocks”, “Gravel”, “Sand” and “Mud”. The make-up of the seabed can be tremendously helpful information when looking for ­fishing grounds, as well as for ­finding good anchoring spots.

The Bottom Discrimination (BDS) feature is unique to Furuno and perfect for those fishos who want to know the bottom composition they are looking at. Locating the exact spot where bottom composition changes will often identify the perfect habitat for fish like snapper and hapuka.

Bottom composition indicates if the bottom is composed primarily of rocks, sand, gravel or mud.

Bottom Discrimination is available on:

FCV627, FCV587, GP1670F, GP1870F, DFF1-UHDBBDS1

With the DFF1-UHD or BBDS1, NavNet can show the bottom discrimination information from the depth sounder echogram. Bottom discrimination can be displayed in four categories. "Rocks", "Gravel", "Sand" and "Mud", in either easy to read graphics of colour display modes. The bottom discrimination function provides you with valuable information to help you locate rich fishing grounds to boost the day's catch. There are two bottom discrimination display modes selectable:

Graphic mode

The standard graphic display mode shows the most probable bottom composition by graphic or four colours

Probability mode

The probability display mode shows the most probable bottom composition in graph form


Please keep the following in mind when using the Bottom Discrimination Sounder:
1) Use at a depth of 5 m - 200 m (DFF1-UHD), 5 m - 100 m (BBDS1)
2) Use transducer in transom mount or thru-hull mount.
3) To show a consistent display of the actual bottom, set the range display of the fish finder screen to “auto”.
4) Enter the ship’s draft value
5) Use a ship speed of 10 kn or less.
6) In some instances, bottom component indicated on the display may carefully differ from its actual bottom structure.