Totally legal as far as I know. If not ive been doing illegal things for quite a while. Like you said it's basically like having another graph on while fishing/running. I love my Navionocs app on my phone. Even though I have the chip in my graph i tend to use my phone more because i can move it around faster.
McMurry University Bass Club President
McCain High-Performance Rods Elite Field Staff
Wicked Weights High Quality Tungsten Pro Staff