I have a E7D MFD with radar and a P79 (thru hull) transducer. My boat is a Seahunt 234, less than one year old. MFD installed upon purchase. Shortly after we got the boat, I noticed the MFD was picking up a depth  reading intermittenly. Last few times I took the boat out, it displayed no readings. frustrating. We've had no fish finding capability. Yesterday, while I was washing the boat I noticed a reading. Is there something I should look at/for that may be causing a fault.  Thanks

Views: 322

Reply to This

Replies to This Discussion

Welcome to the Raymarine Technical Forum Bernie,

Please note that fishfinders are not designed to return a bottom image or depth value when the hull is out of the water.  Begin by checking the following two items:

  • verify that the transducer reservoir is filled as the transducer is designed to transmit energy through the hull via a fluid medium (typically RV antifreeze)
  • verify that the P79 transducer has been selected within the MFD's transducer configuration settings (HOME->FISHFINDER->MENU->SET-UP->TRANSDUCER SET-UP->TRANSDUCER)
  • verify that the transducer is pinging (an automobile diagnostic stethoscope may be helpful in listing to the transducer)

Transducer location is critical to maximizing the performance of the system.  It is also important to periodically check in-hull transducer reservoir fluid levels to ensure that they are full.  Also, when operating in depths greater than 180', the 50kHz frequency is recommended.

From a performance standpoint, properly installed thru-hull transducers will typically deliver the best performance.  The performance of in-hull transducers may be as much 20% lower than a thu-hull of similar transmitting element design.  As hull designs, materials, thickness, and other factors differ, performance of in-hull transducers will vary between boats.

In order to install an in-hull transducer, the following minimum hull requirements must be met:

  • the hull must be constructed of solid, non-cored fiberglass in the location where the transducer will be installed.
  • the hull must additionally be less than 1" thick in the location where the transducer will be installed
  • the hull must not feature hull aerating steps (if so, the transducer must be located forward of the step.  Owners must recognize that such an installation location may cause the section of the hull below the transducer to loose contact with the water when the hull lifts while operating at high speed)

Before bonding the transducer reservoir to the hull's inner surface, it us recommended that this location be tested first.  In choosing the transducer mounting location, it is recommended that baseline performance of the fishfinder/transducer be established with the transducer held over the side of the vessel while the vessel is stationary and in water having a depth of at least 30'.  Suspending the transducer in this manner can also be used to test to operation of the DSM.  A series of snapshots of the fishfinder's image should be taken as a baseline to then compared the performance of proposed transducer installation location(s) while trolling, while on plane, and at high speed.  One would then rest the transducer on a ZipLock bag which has been filled with water (purge all air) and temporarily placed on the inside of the hull in the area where the transducer performance will be tested.  Transducer site testing should be performed while the vessel stationary, trolling, and when on plane until the best transducer installation location is determined.  After testing has been completed and the best installation site determined, then the transducer reservoir may be fastened to the inside of the hull per the transducer installation instructions.

Reply to Discussion




  • Add Videos
  • View All


  • Add Photos
  • View All

Latest Activity

Georges R Paquette replied to Kern Smith's discussion p70: No Pilot - Drive Stopped
"I just received a cable to connect my Fusion MS-AV700 into the NMEA2000 backbone, connected the cable in 2 minutes while at anchor yesterday.  I immediately got full control of the music system from the Garmin 7610 chartplotter.  Today i…"
5 hours ago
Rick Francis replied to Rick Francis's discussion New Raymarine technology interfacing with 2 year old Lowrance FF, GPS/Plotter
"I have seen many chartplotter apps available for IPad, some for Android units, but mostly Ipad.  How can the new i70 and ev100 electronics be connected to an iPad running chartplotter software?  thanks for any input"
5 hours ago
steven Vassallo replied to steven Vassallo's discussion Raymarine C140 W fishfinder wont read in deep water
"Raymarine Fishfinders are complete Junk! "
5 hours ago
Jack Thompson replied to Jack Thompson's discussion Laylines with Lighthouse II ver 14
"Were you able to see the video?  Any Ideas? Thanks, Jack  "
7 hours ago
jim owens replied to jim owens's discussion cp370 and tm 260 transducer
"I went back to the boat today! Verified all the settings and still have no readings. I also put in manual depth and gain but could get soundings. The cp370 green light is still blinking! I would like to know if that is normal"
7 hours ago
Maurice Colontonio replied to Stephen Trehu's discussion Ray 55 VHF transmits, does not receive
"I had the exact same issue. I checked the antenna and it worked just fine. I could transmit but not receive. I could receive only if my squelch was set to zero but the noise was unbearable. I put in a new Ray55 that I bought from Defender industries…"
9 hours ago
Jean Gauthier replied to Jean Gauthier's discussion SR50 SiriusXM interface
"Hi I recently noticed my C120 Classic to be slow in updating position and being erretic in showing the boat position on the map Can you give some indications as to the cause of that situation? Thanks,"
9 hours ago
GregM replied to GregM's discussion Computer Software as an adjunct to my a98 MFD
"I have to tell you that his whole process was a joke. I spent OVER AN HOUR trying to figure out how to purchase, download, install and activate this software and it was RIDICULOUS! I had to go to well over a dozen webpages, back and forth, as none…"
9 hours ago
Susan McNamara replied to Leonard Vance's discussion E7D Transducer Issue
"Installing the P79 seems to have fixed the problem and I get an accurate depth and good sonar.  When I have the boat taken out in the Fall, I will pull out the P58 and send it back for testing.    "
11 hours ago
David Gilbert replied to Richard Itkin's discussion C120W compatibility
"I have finally updated my Navionics + platinum CF  chart card in the C140W.   Just a quick note to confirm that the navionics sonar data all shows up when you switch to the "fish" presentation as noted above.  Cheers Dave"
11 hours ago
Gene Exley updated their profile
12 hours ago
Alan L Clements replied to LUIZ FELIPE CAERDEAL REGO's discussion Dragonfly Software 11.41 losing and not reacquiring bottom
"Dear Raymarine: When is a new release going to be issued for the Dragonfly (post 11.46) to resolve these bottom loss issues?  It seems like this has been going on for awhile and I expected to see an update prior to now.  Still Trying to Be…"
14 hours ago
Gary Gleason replied to Gary Gleason's discussion Digital Radome quit working
"The radar stopped working again. I managed to get it recognized by the chart plotter for about 1 minute and then it quit again. I have 13.5v measured at the radome connector. The diagnostics on the c95 show NMEA packets being sent but none returned.…"
16 hours ago
andy man replied to andy man's discussion A98 + Mercury Gateway problems
"Thanks.  You guys make it too easy.  You are right, the data was there.  All I had to do was start the engine to watch the rpm move and oil temp.   This is why I have nothing but raymarine on my boston whaler!"
Charles Rheintgen replied to Charles Rheintgen's discussion No Sonar Icon on RL70C with DSM250 Sounder
"Thank you for your input.  I think I am actually getting close to understanding.  However, the way mine is set up is like this.  At the DSM250, I have 3 plugs/wires, 1) goes to the transducer, 2) is the power and 3) is a single three…"
Alan martin and Ryan Gilbert are now friends

© 2015   Created by Moderator - Raymarine, US.   Powered by

Badges  |  Report an Issue  |  Terms of Service