Way out of my depth here, but it's fun to learn new things. I was wondering IF a combo GPS/Fishfinder could help with some of that data like water temp?

I have a buddy who has a combo unit and it measures water temp, marks the location and he can plug in a USB stick and download data. It even allows you to use the Ethernet and send the info to tablets/lap tops or a smart phone in real time.

Too technical for me, I'm just curious that's all.