Plug&play module adding CHIRP echosounder
and fish finder capabilities to your navigation system



483.00 € PLUS VAT 







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Higher resolution, less power, less noise

SW BBFF CHIRP offers a high resolution view of targets for an efficient and sustainable fishing.

CHIRP stands for Compressed High-Intensity Radiated Pulse and is a game-changing  technology that has been used by the military, now finally available for professional and recreational sonar.

SEIWA CHIRP sonar transmits a longer pulse than traditional sonar, putting more energy into the water column  achieving: 

  • HD resolution and target definition

  • Greater ability to pull targets from the background noise

  • Improved bottom tracking at higher speeds

  • Improved bottom tracking at deeper depths 

Longer Pulse

Longer Pulse

While traditional sonar trasmit a powerful energy pulse, but short in duration, SEIWA CHIRP sonar can transmit  pulses that are much longer in duration.

Less Noise

Less Noise

A traditional sonar transmits about 1%  of the time, while SEIWA CHIRP sonar longer pulses put more energy into the water column, even though transmitting at lower peak power than traditional fishfinders, thus causing less noise. 

Depth and detail

Depth and detail

Different frequencies reveal different levels of detail. The higher the frequency, the higher the detail, but the lower is the depth that can be penetrated.  

To offer the best combination of depth and detail, SEIWA CHIRP sonar transmits a sweeping range of frequencies from 40 to 210kHz.




ROMEO, the brain of SEIWA navigation systems

ROMEO software is what makes your marine electronics easy to use,
integrating data from different devices with the cartographic info. 

Powerful and flexible, ROMEO is the result of SEIWA's deep knowledge
of both charting systems and marine instruments, gained in more than three decades of activity.

SEIWA ROMEO is constantly improved by our software development team
and our graphic user interface experts, also thanks to our customers' feedback. 

Learn more

Echosounder Integration

CHIRP echosounder and fishfinder capabilities in your navigation system

Fishfinder Integration

  1. Active FishFinder icon

  2. Transducer data: frequency, power of the transducer and water temperature

  3. Variable depth marker

  4. Depth ruler: shows the range of depth, on which the FishFinder is operating

  5. Databoxes

  6. Depth data: units depend on your plotter settings

  7. Vertical time marker is a vertical line on the echogram

  8. Cursor box reporting time and depth data

  9. Compass bar

Never miss a thing

Smart marks from Fishfinder history to map

SEIWA ROMEO software features some special functions dedicated to fishing such as the Smart Marks on FF history!

Browse the Fish Finder history up to 5 minutes  and, if you find anything interesting, place a mark on it, you will find it on your chartplotter map! 

Then, with thanks to the Cursor Box smart function, just point the cursor on the mark’s position in the map to instantly view distance and bearing.

Fishing Ranges

Advanced map option for easier fishing


You can select on your SEIWA charplotter a fishing range: when you know the fish are suspended over certain depths, highlight the range so you can quickly identify more places to check out!

*Function available with NAVIONICS charts.

Learn more






Compatible transducers for SEIWA echosounders 

The quality of the transducers is as important as the quality of the sonar, that’s why we have selected the best transducers in the market, offering a range of options for different uses. 

Find out which is the best transducer for your activity.

Learn more


Which CHIRP frequencies should you choose?

Choose what's best for your activity



< 80 kHz 

It is used in deep water, it offers great depth performance identifying targets at all depths in the water column.

Best for depths: > 600 feet / > 180 m 



80 -160 kHz 

It can display a wider coverage area, scanning large areas more quickly, than high CHIRP. Higher resolution than low frequency CHIRP.    

Best for depths:  < 600 feet  / < 180 m



150 -210 kHz 

It offers high resolution for shallow water, highest detail for smaller objects. Best for inland and freshwater fishing activities.

Best for depths:  < 600 feet  / < 180 m


 Need help in finding the right solution for you ?

Contact us



sw bbff chirp Hardware

Dimensions: 196.4 x 164.9 x 50 mm with holder
Weight: 600 g
Transducer Frequency: CHIRP LF / MF / HF (40 to 210 kHz)  / CW 50 / 200 kHz
Transducer Power: from 300 W to 1 KW
Compatible with Airmar CHIRP  and CW transducers and TWS  transducers
Waterproof IPx6
Operating temperature: -20 °C / +60°C
Storage temperature: -20 °C / +70 °C 
1 built-in power cable
1 transducer connector
1 Built-in cable to plotter 


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SEIWA Romeo software compatible
AIRMAR transducers: Xducer ID® detection system automatically selects the power output and configures the parameters to suit the transducer
Display mode: single and Dual-frequency (CW only)
Zero line rejection 
Alarms: shallow water, water temperature, deep water, etc.
Echogram history
Point on map
Calibration: temperature offset and speed offset 
Waterproof and shock-resistant housing








Installation Guide