Marine Electronics

Marine electronics questions? Ask a technician for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I purchased an 899si fishfinder need to swap the transducer…

Customer Question
I purchased an 899si fishfinder...
I purchased an 899si fishfinder need to swap the transducer foer a saltwarter high def large one what are my obshions?
Submitted: 3 years ago.Category: Marine Electronics
Show More
Show Less
Ask Your Own Marine Electronics Question
Answered in 8 hours by:
6/10/2015
Marine Electronics Expert: Michael Hannigan, Engineer replied 3 years ago
Michael Hannigan
Category: Marine Electronics
Satisfied Customers: 11,888
Experience: 25+ Years Experience in Field. Master Certified Electronics Tech and Technical Consultant
Verified
Hello. My name is***** can help you with your question. There are a huge number of things to consider when choosing a transducer. Especially for salt water.
A couple of considerations - mounting location and specific qualities of the transducer - determine how effectively your sounder does its job. Let's look at placement first. There are three ways to mount a transducer in your boat, and the one you choose depends most on the your hull.
The most complicated is through-hull mounting, where a hole is cut in the bottom of the boat and the transducer is mounted flush with the bottom, so the transducer face is in direct contact with the water. Through-hull mounting is the most efficient way to get the best performance out of a transducer.
Direct contact with the water is the most efficient transducer mount. That way every single ounce of power that you put in the transducer goes into the water. There are some considerations, though. You have to make a hole in the hull, which some people don't want to do, though there are seldom problems with this. If the instructions are followed, you have assurance of 100-percent safety."
The beam of a transducer set to 200 kHz, left, covers less area but shows much more detail. This is the frequency that's most useful for shallow-water applications. The 50 kHz transducer beam, right, sacrifices some detail for a broader beam, useful for searching deep water.
And I think that's the most important part of what you're asking.
Not all hulls are suited for this treatment, so you must be careful when deciding.
If you are uncomfortable with cutting a hole in the hull, another option is to mount the transducer inside the hull, flush against the bottom of the boat, and shoot the signal through the hull. The disadvantage here is the power loss that occurs when the signal must pass through the hull during transmission and reception. In the past, this was much more of a problem than it is today. Even with the power loss, an in-hull mount has some advantages. One other consideration is that an in-hull transducer won't work if your hull is cored, such as with end-grain balsa or foam. In this case you'll need to go with a through-hull or transom mount.
It is not as efficient as a through-hull mount, but it is workable, and it's a lot easier to install. The newest transducers are very high-end and sport fishing models have 65- to 70-percent efficiency."
The third type of placement, on the transom, is usually reserved for smaller boats or when there is no access inside the hull for a through-hull or in-hull transducer. Transom mounting is the quickest and simplest way to mount a transducer, but it must be done properly.
You have to be very careful where you mount the transducer in proximity to the propeller with a transom mount. Try to mount it as far outboard as possible, and separate it from the source of noise.
Bubbles and turbulence can be a problem with other mounting positions, too. Both through-hull and in-hull mounts have to deal with this kind of interference.
Try to keep the block as small as possible, but also try to get the transducer away from the bottom where the disturbed water is
Choose the Right Frequency
Once you've determined where the transducer will go, it's important to buy quality.
The split-beam transducer receives in four quadrants, so we know where in the beam the target is and we can place it in relation to the boat. With a single beam, everything appears directly beneath the boat. Get a split-beam if you have the money - they run $20,000 and up - otherwise, single-beam, with dual frequency, is the way to go
Ask Your Own Marine Electronics Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a marine electronics expertLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Michael Hannigan Your Own Question
Michael Hannigan
Michael Hannigan
Michael Hannigan, Engineer
Category: Marine Electronics
Satisfied Customers: 11,888
11,888 Satisfied Customers
Experience: 25+ Years Experience in Field. Master Certified Electronics Tech and Technical Consultant

Michael Hannigan is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Jason

Jason

Marine Mechanic

588 satisfied customers

Degree in Marine Technology, Also Certified with Mercury Marine, MCM, MIE, VP, Yamaha, Honda, Suzuki

Captain Dave

Captain Dave

USCG Licensed Captain

136 satisfied customers

Over 20 years experience installing, maintaining, and using sophisticated marine electronics.

Tan

Tan

MerCruiser Certified Technician

91 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Neil

Neil

Marine Electronics Dealer

73 satisfied customers

NZCE Electronics and Computing

Ropesmarine

Ropesmarine

Boat Enthusiast

70 satisfied customers

13+ years of installing and troubleshooting, FCC License with radar endorsment, CMET

Noel Schembri

Noel Schembri

Marine Technician

51 satisfied customers

Marine mechanic / electrical technician

yachtwork

yachtwork

Marine Engineer

35 satisfied customers

Yachtmaster Ocean & MEC3

< Previous | Next >

Related Marine Electronics Questions
I have a echoMap 74sv and i need a kit to mount it in the
i have a echoMap 74sv and i need a kit to mount it in the dash of my new boat … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 2005 Yamaha xc 1000 jetski (or its a 1100) the
I have a 2005 Yamaha xc 1000 jetski (or its a 1100) the engine was replaced last year and failed, somehow there was water mixed in with oil from sometime of internal problem, it was under warranty and… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
60 hp Yamaha model 60tlrb. Rebuilt carb. New filters.several
60 hp Yamaha model 60tlrb. Rebuilt carb. New filters.several new ngk plugs. Idles great.try to accelerate and fowls #3 plug.… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a Rinker 212 with the 5.0 Merc. It has started this
I have a Rinker 212 with the 5.0 Merc. It has started this intermittent issue where the starter will not turn over when I turn the key to start. I might have to do it 20 times and then it starts fine.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
My 50hp Honda OB will start easily. Idles well. New plugs,
My 50hp Honda OB will start easily. Idles well. New plugs, new gas filter, new gas. I can't accelerate past 2500 rpm (gradually) without the engine stalling. Any suggestions?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
I have another question about my 1995 Mercury 225 hp efi
Jason , I have another question about my 1995 Mercury 225 hp efi outboard. Please call me (###) ###-####… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
Just bought another boat and want to sell prior boat-both
just bought another boat and want to sell prior boat-both have a garmin I want to see if I can transfer garmin units without changing the transducer if possible/want to see if they are compatable? … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a gen2 hds with a 8inch screen. My unit went turn on
I have a gen2 hds with a 8inch screen. My unit went turn on sounder board hence I'm getting a no source from my structure scan. Also my sonar has no depth but it does have temperature. I switch my uni… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
On a garmin panotix ps 22 tr, do they make an extension
on a garmin panotix ps 22 tr, do they make an extension cord, and does the extension cord cause a deteration of the picture? … read more
Russell H.
Russell H.
Computer Technology Consultant
Vocational, Technical or Trade Scho
789 satisfied customers
I just receive SIMRAD GO9 today. No very simple. Dealer I
Dealer I bought Go9 from has NA-Y070 C-Map insight PRO in the box… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have 1997 mercruser black scorpion 350 with a delco est
I have 1997 mercruser black scorpion 350 with a delco est distributor. Should the shield or poles or anything move like a mechanical advance? It's overheating and lack of power. We rebuild the top end… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
Can i use multiple transducers with my Garmin 7610XSV, is
can i use multiple transducers with my Garmin 7610XSV, is aAirmarTM185HW 1KW compatible? … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I was cruising Saturday in my boat, has a 2002 merc 115 4
I was cruising Saturday in my boat, has a 2002 merc 115 4 stroke, when I first got out there and sped up to around 4-5k rpm the engine would back down to idle speed. It did this a couple time so I kep… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
OMC outdrive 1991 V8 engine. Ford 351 Cu In Model 584APLRGD,
OMC outdrive 1991 V8 engine. Ford 351 Cu In Model 584APLRGD, Impeller Question.How can I be certain that I have good water flow to the impeller **Before** I start the motor? I have accidently started … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
I just replaced the tilt trim unit on my 115ETL780 115 hp,
I just replaced the tilt trim unit on my 115ETL780 Johnson 115 hp, with the unit off a newer E60TLESM Evinrude. The old unit was a 3 wire unit with a single solenoid box, new unit is a 2 wire unit. I … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
You helped me out in the past - excellent service! I have
Hello JasonYou helped me out in the past - excellent service!I have the 2004 Yamaha TLR50 3 Cyl 2 Stroke I recently cleaned the carbs - getting ready to go in water. Looks like some adjustments are of… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
588 satisfied customers
My boat is bogging down in full throttle. It won't get up
My boat is bogging down in full throttle. It won't get up and just go like it's supposed to. Never really reaching is 5500 rpms. More around 4-4500. Sounds great isn't missing or anything. My full spe… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Pearl. I recently tried to install my Boss Audio system
Hello, Pearl. I recently tried to install my Boss Audio system MCK632WB.64 in my '08 Sweetwater pontoon boat. I've discovered that the wiring harness that is on the boat is for 11 wires and the Boss r… read more
Expert-Repair
Expert-Repair
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
11 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x