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Old 19 September 2015, 08:48   #1
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Garmin 45DV chartplotter & transducer fit to SIB (Aerotec)

I've tagged a few comments/queries onto other threads about upgrading my GPS from a very small screen handheld to a compact 12v fixed unit.

Chose the Garmin EchoMap 45DV with UK mapping and bought a bundle to include the GT20 DownVu transponder... well priced and next day service from Barnet Marine.

Some images below of the unit and comparison with the small screen handheld I've been using for years. I know the 45DV is a compact unit compared to many of the RIB boys kit but the increase in screen size is still worthwhile.

I've not had a depth sounder for years since owning a hard boat but thought I'd buy the transducer which was sold as an extra... just to complete the outfit really.

Paid an extra 30 or so to get the DownVu type transducer over the standard to get the more "TV like" underwater images... no idea if it's a worthwhile upgrade but Garmin obviously think so.

Running on demo mode in the house quite impressed with screen clarity and easy use of the menus. Much more sensitive GPS receiver than the handheld which wouldn't get a fix in the house... this one easily does.
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Old 19 September 2015, 08:53   #2
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So... looking for ideas on fitting the unit with a small battery pack... and for mounting the transducer to the transom which with a daily set-up SIB must be an easy fit/remove.

I'm going to mount the unit bracket on the seat to one side. I'd wondered about some sort of arrangement with the 12v battery it needs and spare leads all in a waterproof box fixed under the seat (battery in pic is just the one from my Bravo pump used for testing... for the Garmin I'll get away with a smaller one).

I've had ideas from another thread re some sort of transom mount but with these images of the transducer/brackets hope to get some more specific thoughts.

I do wonder if the somewhat confused water flow off the transom of the Aerotec might need the transducer setting a little deeper than the just down from the transom edge on a flat floor type as is usual?
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Old 19 September 2015, 09:54   #3
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my mate bought that unit he is very impressed with it
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Old 19 September 2015, 13:10   #4
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Hi David

Looking at your set up I would follow the instruction for set up in the paperwork, you have a kick up bracket by the looks and the transducer should be just below the hull, set it up so you can use the slots to lift/lower the unit as required I have done a few now that way with no problems good little set up that and will do exactly what you ask of it.
The sounder by the way is well worth it if only to show depth at all times with a shallow alarm a bonus and a picture of the seabed with all that offers for interest you never know you might get into fishing then it will come into its own.
Cheers Jeff
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Old 19 September 2015, 14:37   #5
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Jeff. What do you reckon to the shape of the Aerotec transom area for disturbing the water flow... do you think it needs to be deeper?
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Old 20 September 2015, 11:05   #6
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Hi David

I Carnt see why it shouldn't work after fitting a hummingbird transom mount to my last rib with a 24degrees dead rise I would look at fitting it as near as possible to your transom wheels on the flat as it were don't forget when your sounding your at trolling speed around 3-6 mph you will get just surface clutter at speed but you will get depth readings so long as you set it square to the boat meaning not at an angle one way or the other.
Cheers.
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Old 20 September 2015, 13:25   #7
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Ok thanks. What I might do to save the stress of drilling holes for a test position that needs changing meaning even more holes is to mount the transducer on a bit of alloy angle and use a G-clamp for the trial so I can put it up and down to get the best result.

Still keen on any ideas/images for a battery box that can be fixed under the seat below the main unit.
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Old 20 September 2015, 13:34   #8
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I used a plastic sandwich box and strapped it at the side of the fuel tank with the standard honwave tank straps worked fine for me . the battery not the transducer
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Old 20 September 2015, 13:38   #9
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Oh yes that's an idea... we always have the tank in its underseat posn where the loops are on this boat and the cables would drop straight down and be out of the way.

Does your outboard charge the battery and what capacity do you use?
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Old 20 September 2015, 13:47   #10
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not sure if mine has charging but as its a pull start I doubt it if your using one of those 15 quid yuasa sealed jobbies like I had I used mine for a week at loch ken and a week on luing on the charge that was in it when I bought it then I bought a rib and put my garmin on that and gave the yuasa battery to a friend who used it for a week at clachtol and it still had charge in it, so I wouldn't worry to much about it going flat while your out fishing
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