Hey, I feel like I can actually provide information instead of asking for help for once!
Anyway, I have a QuadLock case for my phone. Basically its a system where the case can lock into a number of accessories mounts, and they also have a stick-on universal adaptor so you can use it with phones they don't make a case for, a tablet, etc.
I have a QuadLock clip on my PFD so I can just clip I there when not in use (I use it a lot for the lake map and photographing fish). And I have a small retractable tether attached to my phone and PFD.
I also have a QuadLock tripod mount attached to a YakAttack PanFish Portrait Pro (say that 5 times fast) camera mount, mounted forward in my boat. That way I can see the lake map hands free while I'm paddling or fishing, it could be used to take a photo of me and my fish as well, but I'm still figuring out the best position for that.
Basically, my phone is either always on a mount, or a tether, or both.
In the photo you can see, well, first and foremost the 18" smallie I caught during a quick after-dinner outing last night, and also the two tethers on front of my PDF, and you can just barely see the QuadLock clip in front of the bass's pelvic fins. I think I can get a better camera angle if I'm better prepared.
I'm still trying to work out the best way to secure a rod so I don't loose them all in the drink though. I have tried a home-made rod float and found it annoying. I feel like tethers for each rod would get messy quickly (and I only have 3).