Finally got to use my new unit. Spent a whole day (two days ago) getting the settings figured out and what not. Everything worked wonderfully. Yesterday I powered it on and started fishing, but about 20 minutes after it being on it beeped one time and shut down. When i looked at the screen, in little itty bitty letters, it said "boot failed". i used the power button to try and turn it back on and it came to the "main screen" where it says eagle fish elite 480 in big letters, but would never actually load up or turn all the way on should i say? I then disconnected it from the battery waited a few seconds and reconnected it and it worked fine the rest of the day. Any ideas on what this could be?

Also what settings do you guys typically change when you go from clear to murky water, and shallow to deep?

Thanks for the help everyone, Rob