Humminbird Compatible P13???

Just picked up a used P13 and noticed it had "Humminbird Compatible" printed on it. What is Humminbird compatible on this yak?. Thanks

Ed

If you notice one of the rear scupper holes on the bottom side is slightly ecessed larger to mount a transducer. Pretty neat.

Jeff

so the tridents have it in the foot well they have it on the rear cargo area, if you do buy a himminbird ff you can send thew transducer to them and get the correct one for free you pay sipping there like ten bucks, beats 90$ on the site.

I just looked and all the scuppers appear to be the same. Am I missing something?. Do you need a special transducer to fit this specific scupper?. If so, which one?. All the Scuppers are much larger than the first run old school scuppers on my P15. Thanks for any help.

They all use the same transducer...  http://store.humminbird.com/humminbird-products/transducers/piranhamax/xth-9-20-p-plastic-thru-hull-transducer/prod710167-1.html 

On the Trident series it goes in the footwell, on the P-15 and P-13 it goes in the TW.

and even though they dont say, it will have a temp sensor on it, just got mine done and so easy  , no water or goop and i can stuff lots of junk in the trunk