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Hooking up 2 batteries (IN SERIES) will give you 24 volts. First make sure the 2 batteries are exactly the same. Do not use mismatched batteries. Hook the POSITIVE of first battery to the NEGATIVE of the second battery. Then hook your LEADS ( hot and ground) to the 2 remaining posts. That will give you 24 volts. When charging the batteries with a charger, hook the charger up to the LEAD POSTS.
That model is meant for marine (boat) use. You can pre-test it anywhere as long as you are providing the proper power source. It's meant for 12vdc. If you have a marine battery, or a car battery handy, just power it up from that. You do not want to plug it in to household current, you would fry it in a matter of seconds. I would suggest hooking it up to the power 12v outlet in your car of truck to test it.
Cut the battery wires where they hook up to the machine. When cut they might need some more wire spliced to them. Get some alligator clips to put on your red and black wires to hook right to your boat battery. When not in use on the boat get a small 12 volt battery, cheaper then two 6 volt disposables.
This is a common problem if the GPS is hooked up to an electronic heading sensor such as an autopilot. If the heading sensor is not calibrated properly, the boat will appear to be facing the wrong direction.
If you have an autopilot, consult the installation guide and perform the sea trial procedures. That should get your boat lined up properly.