I have a Humminbird 959DI on the bow hooked up to a 360 on a Da'Ducer mount. A month ago, all was well & could mark waypoints while on the 360 screen and see them as I was coming up on them. Now, something has jumped goofy & I can't mark waypoints nor can I see the waypoints from the 360 screen. I have the most current software on both the core unit and the 360 transducer, and have restored defaults twice. Other than that, it's working flawlessly and will put you smack dab on top of a stake bed. Anybody got any ideas, or is this a "send back" thing???