Marine Electronics Forum - Best option for water temp readings?

THE HULL TRUTH is the world's largest FREE network for the discussion of Boating & Fishing. Whether you're researching a new boat, or are a seasoned Captain, you'll find The Hull Truth Boating & Fishing Message Forum contains a wealth of information from Boaters and Sportfishermen around the world.

03-26-2012, 10:24 AM
What do THT experts think would be the best/easiest option to add a surface temp reading to my boat. My current setup is a Garmin 740 chartplotter with an N2k network. I have the GXM 51 weather antenna and the weather subscription but it doesn't provide enough resolution to see temp breaks and is dependent on clear skies. I also have a Furuno 620 with the p79 transducer. I know there is a p63 temp/speed ducer for this to transom mount. I am happy with the p79 performance but would there be enough of increase in performance by going with the 600watt thru hull transducer which has temp gauge to justify drilling a hole in the bottom rather than just adding a transom mounted temp gauge. I have also seen where some of the yamaha's can give temp reading if hooked into the network. Any help would be appreciated, just trying to make sure I know all the option before I make a decison. Thanks. Brian.

03-26-2012, 10:32 AM
I went through the same searching. I have an m260 ducer so I don't get temp with it.

I ended up installing an airmar through hull temp sensor that connects using nmea0183. The fitting allows me to remove the sensor itself, even in the water, and replace it without having to change the thru hull fitting itself. It's just an insert, and is very accurate.

You can also get them with n2k connections, but those have more parts and are more expensive.

03-26-2012, 01:30 PM
You can also use a T80..right at $50.

The T42 is a higher quality than the T80.

03-26-2012, 02:42 PM
This is the one I installed (B17-HP).

03-26-2012, 02:52 PM
This is the one I installed (B17-HP).

I really like that one you said removable insert.

03-27-2012, 04:24 AM
I have the Garmin 740s and M260 shoot thru the hull transducer. I used the T-80 sensor Semper-Fi displayed above. I have a bronze garboard plug for bilge drain, so I removed the plate for the drain plug, ran the sensor thru the hole and cut a groove for the wire to lay in under the plate, fastened the sensor just above the garboard plug, and bedded the plate in a layer of 5200 over the wire.That avoided a bigger hole in the bottom using a thru hull sensor and also a wire running down the transom from above for a transom mount. Makes a neat installation. The T-80 comes with a 23' cable with a "y" connector and costs about $50.

03-27-2012, 06:08 AM
holy crap! where was this thread 2 weeks ago...guess i should have started it. i just got a t42 to replace my t80 that i have mounted on my transom. the problem with the t80 is while on plane it doesnt read accuratly i assume because its up out of the water. therefore the t42 thu hull should solve that problem? i have the t42, just havent installed it yet, but i never saw the b17. the t42 has a 15 second thermal time constant (roughly the time it takes to register a change) while the b17 is only 5 second. i guess its not a huge deal, but i want the best bang for the buck and they are near the same cost.....decisions....

03-27-2012, 07:00 AM
I've been very happy with the b17. Again, the really nice feature is you will never have to replace the through hull fitting, just the sensor. And this is a universal fitting for airmar, you can probably even find a transducer that will fit it if needed.

03-27-2012, 08:12 AM
Thanks for the info guys. How accurate are the temp sensors in the thru hull transducers like the B60? I don't think the transom mounted T80 will give me what I need just for the reason JZD described. If I am going to be left placing a thru hull I may as well get the the transducer with temp sensor or are they not as reliable/accurate? Thanks again for the help.

03-27-2012, 08:59 AM
SiTex SST110

03-27-2012, 09:07 AM
Back up temperature sensors..

03-27-2012, 12:27 PM
Back up temperature sensors..

I would go with these. I've used them before on multiple boats. Very cost effective and the hotter it is, the better they work.

03-27-2012, 02:10 PM
SiTex SST110

x2 on the SST110. I did it on my old boat with an M260, it was a simple install. I think i drilled a 5/16" or 3/8" hole in the hull...

Search Engine Friendly URLs by vBSEO 3.2.0