I am surprised your Lowrance unit even stayed on with that low a voltage. That has to be at the low limit of voltage for it to even work.

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Haha, Hey, I just found out that if it goes below 8.8 volts it will shut off. I have not been using my boat and did not charge the battery up lately, but the today I added a new unit. I now have two 522C and I linked them together with both an ENET and N2K network and they work great. The ENET lets me share both tranducers and the N2K lets me share waypoints. I only needed two cables to hook it up and it cost $80. Pretty cool.

You should connect your 522 to your cranking battery. I have this same unit and one thing that really saved me while night fishing was this unit. Well not the unit itself but one of the features. You can display any additional information on any page you want. One great one is battery voltage. Now back to why this was important to me. While night fishing, I looked down at my sonar screen and I saw my battery voltage had dropped down to 9.1 volts. I went to crank the engine and I barely got it started. If I did not hook this unit up like I did I probably would have been in a very bad situation. Now as long as I stay about 9.5 volts I have no problems. PS it’s also a very good idea to have jumper cables on your boat just incase you need to jump off a trolling motor battery.