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installing gps-gctid372061

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    installing gps-gctid372061

    hey everyone its my first time on this forum and i love how helpful the people are here!

    So i just got a bayliner 2655 and i was just wondering if its a long process to install a gps|fishfinder to do it my self, i am new to boats so please dont mind me if dont make sense lol.


    It's pretty easy these days- many combo units have the GPS antenna built in, and the rest is pretty simple:

    Locate where you want the head unit and transducer. Install same.

    Locate source for power. Wire it up and go play


      If you have radar you have to make sure the GPS head is not within the transmission beam of the radar. Other than that it is pretty simple.

      Sometimes it is a challenge to keep the fish finder transducer out of the prop wash as well.

      If you drill holes in your transom below the waterline make sure you use a proper sealant....NOT SILICONE!!!

      Try 3m 4200 or 5200.


        If you want to use the fish finder portion of the unit, you will also have to install a transducer. There are basically three options there, transom mount, through hull, and in hull.



          piece of cake, I have been installing Fish finders and gps/fish finder combos since I was 16, its very easy.


            Well i guess it doest seem hard to do but thanx for the help everyone!


              klajger wrote:
              Well i guess it doest seem hard to do but thanx for the help everyone!
              If you have questions just post em, we will help ya.


                I doubt you will be installing the transducer with a through the hull model.

                So that leaves a shoot through the hull or a transom mount.

                The transom mount is needed if you want the temp feature found on most.

                To avoid drilling a hole in the transom to get the cable to your dash, run the cable through the drain that comes out in the hatch you will see when you open the hatch. Use a round (rat tailed) file to notch the lip so you can get the cable in the bilge without crushing it when the hatch is closed. Glue it in with something like 3M 5200.

                Now you have the cable in the bilge and can find a path to your dash. Follow the steering or shift cable is a good way.

                If you choose a shoot through the hull, Bayliner installs them just ahead of the engine so that should be a good place.

                What I do to mount the transducer in the bilge is get a piece of plastic pipe or anything just a bit larger than the transducer. I use some old exhaust hose. Clean the spot you choose and attach your temp. dam with any sealant.

                Be sure the boat is level or in the water even better.

                Mix some fiberglass resin and pour in your mold, just covering all the bilge. It will be tapered so it will be thicker on one side than the other.

                When it hardens, mix up a little more, enough to cover the resin about 3/8' thick. Pour it in the mold and squiggle your transducer in the fresh resin. You don't want any air bubbles in either application.

                When it hardens you have your transducer shooting straight down, not off to the side.

                A good feature of this is if you want to remove it, smack it with a rubber hammer and it will pop right off clean and reusable.

                If you are in the water and want to be sure the spot is good, fill a ziplock with water. Place it on your spot, hook up your unit and see if it works. If it does, you have found a good spot with no air bubbles in the hull.

                In talking to Humminbird about this several years ago I was told resin is about the same as water for the signal.

                I have an expensive through hull Raymarine unit on my 3870. I also have two shoot through the hulls mounted like I mentioned. At 200 feet there is no noticeable difference in the readings of any of them.

                Started boating 1955
                Number of boats owned 32
                3870 presently owned
                Favorite boat. Toss up. 46' Chris Craft, 3870 Bayliner


                  Consider as part of your project connecting the GPS to your radio and registering an MMSI number. (upgrade your radio if neccessary.)

                  MMSI is a nine-digit number assigned to a marine radio & transfers your registration information to the U.S. Coast Guard for use in emergency situations. BoatUS offers fast & easy way to obtain an MMSI number. Learn more here!