Beam Transducer
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 GARMIN GPSMAP 135 168 178 178C 420s 430s 431s 440s 441s TRANSOM MOUNT TRANSDUCER  US $54.95
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 Humminbird 998c SI Combo W Side Imaging Sonar External GPS US $2,135.99
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 Humminbird 798ci Hd Si Combo 407970 1 US $924.98
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 GARMIN GPSMAP 525 GPS Marine Navigation Chartplotter 010 00597 00 US $404.95
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 NEW GARMIN OEM TRANSOM MOUNT TRANSDUCER for GPSMAP 546s 720s 740s GSD 20 21 22 US $66.00
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 Garmin GPSMAP 431s with preloaded US inland lakes US $379.00
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 GARMIN FISHFINDER 160 160C 240 250 250C 300C 320C 340C TRANSOM MOUNT TRANSDUCER US $54.95
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 GARMIN 010 00952 00 ECHOTM 300C FISHFINDER Fishing Boating Outdoors Sonar US $233.65
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 HUMMINBIRD 788CI HD DI COMBO DOWN IMAGING COMBO 408130 1 US $799.99
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 GARMIN OEM TRANSOM MOUNT TRANSDUCER for FISHFINDER 240 Blue 250C 320C 340C 400C US $66.00
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 Garmin Echo 300C color Fishfinder w dual beam Transducer Brand NEW US $189.99
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 Garmin B60 20 20 Degree Tilted Element Transducer US $192.50
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 Garmin Echo 300C color Fishfinder w Transducer NEW US $189.99
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 GARMIN GPSMAP 440s 441s 541s TRANSOM MOUNT TRANSDUCER US $66.00
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 NEW GARMIN OEM TRANSOM MOUNT TRANSDUCER for GPSMAP 530s 531s 535s 540s 541s 545s US $66.00
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 GARMIN GPSMAP 535s 720s 740s TRANSOM MOUNT TRANSDUCER US $66.00
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 GARMIN DUAL BEAM TRANSOM MOUNT TRANSDUCER 010 10249 00 US $54.95
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 GARMIN GPSMAP 420s 430s 440s TRANSOM MOUNT TRANSDUCER US $54.95
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 Garmin Gpsmap 521s Gps Chart Fishfinder W o Xducer 010 00760 02 US $573.55
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 Garmin GPSMAP 740s Chartplotter GMR18 HD Radar Combo US $2,319.00
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 Humminbird XNT 9 20 T 710198 1 Transom Mount Transducer Design New US $63.99
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 GARMIN FISHFINDER 320C 340C TRANSOM MOUNT TRANSDUCER US $54.95
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 Hummingbird 710198 1 Humminbird XNT 9 20 T TM Transducer 83 200 kHz US $65.58
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 Garmin GPSMAP 740S Radar Pack w GMR 18 HD US $2,304.19
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 Garmin GPSMAP 531S GPS Dual Beam Combo US $625.95
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 Garmin 010 00773 00 GPSMAP 536 MARINE GPS US $719.21
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 Garmin 010 00761 00 GPSMAP 531 MARINE GPS US $546.48
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 Garmin 010 00761 00 GPSMAP 531 MARINE GPS Kit US $590.20
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 Garmin 010 00773 00 GPSMAP 536 MARINE GPS Kit US $776.75
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 Hummingbird 858C Combo Sonar GPS Color US $999.99
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 Hummingbird 798Ci HD Si Combo Sonar GPS US $1,049.99
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 Hummingbird 788Ci HD Combo Sonar GPS US $1,049.99
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 Hummingbird 385I Combo Sonar Gps Color US $449.99
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 Hummingbird 120 Fishin Buddy US $199.99
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 Garmin Transducer B60 Tilted element 20 TH New Warranty US $196.99
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 GARMIN BRONZE THRU HULL MOUNT TRANSDUCER B265LH CHIRP 010 11645 20 US $1,333.29
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 Humminbird Fishfinder Chartplotter 581i Internal GPS Model 407330 1 US $384.88
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 Garmin 010 00760 02 Garmin GPSMAP 521S GPS Chartplotter Fishfinder w o Transduce US $623.30
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 Garmin 010 00765 01 GPSMAP 431S MARINE GPS Kit US $493.44
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 Garmin 010 00766 02 Garmin GPSMAP 441S Chartplotter Fishfinder Combo w o Transdu US $532.15
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 GARMIN GPSMAP 521S GPS CHART FISHFINDER W O XDUCER 010 00760 02 US $575.03
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 Garmin 010 00762 00 GPSMAP541 MARINE GPS Kit US $680.84
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 Raymarine E120w E62223US 12 in display 2 year warr US $3,999.00
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 Raymarine C120W System Pack C120W Display RD418D 10M Cable Model T62291 US $3,049.99
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 Garmin 5 sunlight readable display GPS US $304.65
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 GARMIN GPSMAP 536S MARINE GPS COMBO DUAL BEAM NEW US $839.75
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 FURUNO 527ID IHD 1KW DUCER IN HULL 10PIN US $712.50
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 HUMMINBIRD FISHFINDER 597CI HD DI COMBO DOWN IMAGING COMBO 408120 1 US $660.12
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 Garmin GPSMAP 431S GPS Dual Beam Combo US $454.99
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 GARMIN GPSMAP 441S W TRANSDUCER PN 010 00766 01 US $474.00
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 HUMMINBIRD FISHFINDER 587CI HD COMBO 407900 1 US $479.45
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 Garmin GPSMAP 441S Chtplter Combo w o Transducer US $488.99
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 Garmin echo 500c Color Dual BM Fishfinder TM Trolling Transducer US $318.71
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 Garmin GPSMAP 740S Radar Pack w GMR 24HD Model 740S GMR24HD US $3,499.98
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 Humminbird 710203 1 Xtm 9 Qb 90 T Trolling Motor Transducer 7102031 US $94.99
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 Furuno TM260 TM 1kW Transducer w Bracket TM260 10F US $861.84
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 Garmin 200 50kHz 12 45Deg Plastic Transom Mount w Depth Temp and Speed US $115.48
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 Humminbird 710198 1 Transducer Xnt 9 20 T 7101981 US $74.99
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 Humminbird 7101611 Portable Transducer 710161 1 US $74.99
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 Navico P79 In Hull Transducer US $117.75
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 Garmin echo 500c Color Fishfinder TM Trolling Transducer 010 00954 00 US $321.00
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 Standard Horizon DST521 Transom Mount Transducer Depth Temp Speed US $95.90
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 Garmin GPSMAP 541s US $679.99
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 NEW HUMMINBIRD 581i COMBO FISHFINDER MARINE GPS With ANTENNA US $349.00
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 Garmin Speed Sensor US $58.40
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 Garmin 010 00765 01 GPSMAP 431s Marine GPS Navigator 4 QVGA Color LCD SD Card US $537.19
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 GARMIN ECHO 200 DUAL BEAM 5 FF TM TROLLING TRANSDUCER US $159.99
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 GARMIN ECHO 100 SINGLE BEAM FF TM TROLLING TRANSDUCER US $81.43
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 Interphase T1 0200 021 Transom Mount Speed Temp Transducer US $87.39
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 Standard Horizon SIA51 TM Transducer US $74.75
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 Raymarine DSM 300 DSM 300G fishfinder sonar US $659.99
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 Navico B258 Bronze Thru Hull US $684.09
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 Humminbird XAP 9 20 Angled Puck Transducer US $61.73
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 Garmin GPSMAP 431s Chartplotter Sounder US Lakes Maps Dual Beam Transducer US $452.00
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 NEW Garmin GPSMAP 431s Marine GPS Navigator US $390.47
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 Raymarine C90W DSM30 System Pack T62288 NV US $2,149.99
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 Garmin GPSMAP 546s BRAND NEW PN 010 00774 01 US $869.00
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 Humminbird 710211 1 Transducer Xi 9 20 Single dual US $94.99
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 Garmin Gpsmap 441s Gps Chart Fishfinder Combo W Tm 010 00766 01 US $493.98
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 NEW RAYMARINE T62348 C 90W System Pack with GPS DSM 300 SONAR RD418D RADAR US $2,799.00
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How to Choose a Transducer
What Type of Fish Finder Transducer do I need for the Type of Fishing I do?
The information about fish finder transducers can be both overwhelming and difficult to understand. This article lays out the different aspects of transducers and offers some suggestions on the type of model you may need. These guidelines can be used for both fixed mount and portable fish finders.
Frequency (LOW frequency vs. HIGH frequency)
Transducers come in Low and High frequencies. Low frequencies generally range from 50 to 100 kHz. High frequency models generally range from 180 to 200 kHz. Lower frequency sound waves can travel greater distances. They penetrate further in the water.
Lower Frequency = Greater Depth
You need to also keep in mind that fish finders are generally designed to work with specific frequencies (or a couple of frequencies).
IMPORTANT: If you purchase a transducer separately, or you already have one, make sure your model will work with the frequency guidelines of your fish finder. This applies for portable fish finders as well as mounted models.
Cone Angle
A transducer works by concentrating a sound wave into a beam and emitting this beam into the water. This beam is emitted in a small arc (measured in degrees) from the transducer. As the beam travels deeper into the water, the arc covers a wider area. If you plot the area the beam covers on graph paper it will look like a cone, thus the term “cone angle”. If you draw a line from the very tip of the cone down to the cone bottom you have identified the center line of the cone. The emitted sound wave is strongest close to this center line and diminishes as the distance from center line increases.
Cone Angle becomes important because the greater the angle the bigger the coverage area and therefore the bigger the area that the fish finder can “see”. As you move further away from the center line, the clarity of the image decreases.
Frequency and Cone Angle Working Together
High Frequency transducers come with either a narrow or wide cone angle.
For shallow water fishing, a high frequency (180 – 200 kHz), narrow cone angle (20o – 30o) model may be a good choice. You will not be able to see great depths, but you’re in shallow water. The narrow cone angle will allow you to see things more crisply than a wide cone and will allow you to be able to distinguish the objects you see on the display easier. If you really want to see a large area, then think about a wide cone angle instead.
For deep water fishing you will most likely want to search the highest volume of water possible in the shortest amount of time. Consider fish finders that have a low frequency (50 – 100 kHz) for greater depths, and a wide cone angle (40o – 60o) for greater horizontal distances from the cone center line. This combination will allow you to see at greater depths, but the definition (how crisp the image is on the fish finder’s display) will not be as good. You can increase the definition by buying a fish finder with a higher sensitivity display.
Here’s a quick summary:
High Frequency/Narrow Cone Angle
- Shallower depths
- Better definition (crispness) and object separation on the display
- Less susceptible to outside interference.
Low Frequency/Wide Cone Angle
- Deeper depths.
- Less definition (crispness) and object separation on the display.
- More susceptible to outside interference.
Dual Frequency Transducers
Low frequency, wide cone angle setups do have some limitations. For example, you can cover a wide area and a greater depth which gets you into the “general” area of where the fish are, but we don’t want to fish in the general area, we want to put our lines directly in front of the fish.
To do that, fish finder manufacturers developed Dual Frequency Transducers. (Humminbird Fish Finders refer to these models as dual beam rather than dual frequency.) Dual frequency models, as the name implies, have two different beams that project at different frequencies. One is set to a low frequency and the other to a high frequency. Many fish finders will allow the fisherman to switch between the two beams on the display. There are also models that have a split screen display that allow the angler to see images from both beams separately at the same time. Some manufacturers even have displays that combine the imagines from the two beams into one image. The display essentially combines the high-frequency detail with the wider beam and deeper search capabilities of low frequency.
For deep water fishing, dual frequency transducers are a great option. They let you find the general area of the fish over a large volume of water using a low frequency-wide beam setting, and then, for greater accuracy, pinpoint the depth and location using a high beam-narrow cone setting for greater clarity.
For shallow water fishing, a dual frequency transducer may be overkill. There is little need to see fish at a depth greater than a hundred feet so a single beam, high frequency model may a better option.
Overall, there are a lot of choices in fish finders. The transducer is one of the key components of fish finders, whether they are fixed mount of portable fish finders. Make sure you know what type of fishing you are planning and then select a fish finder based on your specific fishing needs.
About the Author
Karen Janos is an expert on fish finders. When she is not fishing she is the webmaster for http://www.fishfindersdirect.com.