On my boat is an older gps that has had the buttons missing and so on. It works...it tells me the temp/speed/depth of the water. I need a GPS because since im new I really dont take many chances going away from the boat launch and i feel thats holding me back. Ive used my phone a bit but once it loses signal its not good. I want to buy something under 400 or so bucks that could help me. Something with a map thats shows me where the launch is and a map of where i am so i can see upcoming areas? Am I asking too much? Thanks for all the help!