Basically it is a cheap way of mapping the ground contours. The system is a multi-beam sounder which means it marks the grounds depths using a beam width of 120 degrees port-starboard. Not looking ahead or behind but a wide 'brush' looking and marking depths under the boat and each side, all the time. Being a network sounder it does not come with a traditional display but connects into a Maxsea Timezero plotter or a TZTouch. Think of this as a cheap 'Wassp' system which does not plot hardness. 

The DFF-3D is an innovative tool for efficient fish location and seabed profile surveying, utilizing new multi beam technology. Highly detailed images are derived from the combination of an advanced signal processing system and an amazingly compact multi beam transducer.

Compatible with NavNet TZtouch/TZtouch2 or Windows OS with TZ Professional software.

Now for the funky promotional video

Specifications

GENERAL	TX FREQUENCY	165 kHz
	OUTPUT POWER	800 W
	MINIMUM RANGE	3 m
	BASIC RANGE	5-1200 m
	DETECTION RANGE	200 m* (Side Beam Best Performance) 300 m* (Main Beam Directly Under Boat) *Depending on bottom, water and installation.
	BEAM ANGLE FOR TRIPLE BEAM SOUNDER	20°-50° from right under
	DISPLAY MODE	Triple/Single Beam Sounder, Side Scan, Cross Section, 3D Sounder History
INTERFACE	LAN	1 port, Ethernet 10/100Base-TX
	EXTERNAL KP	1 port (optional external KP kit required)
ENVIRONMENT	TEMPERATURE	-15°C to + 55°C
	RELATIVE HUMIDITY	93% or less at +40°C
	WATERPROOFING	IP55
POWER SUPPLY	DFF-3D	12-24 VDC, 1.4-0.7 A
	RECTIFIER (PR-62, OPTION)	100/110/220/230 VAC, 1 phase, 50/60Hz
EQUIPMENT LIST	STANDARD	Multi Beam Sonar: DFF-3D Transducer  B54 (Bronze, for thru-hull mount)            SS54 (Stainless, for thru-hull mount)        or TM54 (for transom mount) Spare Parts, Installation Materials
	OPTION	External KP Kit Cable Assembly (2m/10 m) Rectifier PR-62
DIMENSIONS