When we bought the boat this year it came with a Northstar 6100i. Very nice unit, so I have been chomping at the bit to use it. Invested in a Navionics Platinum Card and found out that the GPS does not work. Checked the connectors to the antenna, they are good and the cable is good. Called Northstar and they said we should have 5 VDC at the back of the unit and then at the antenna. That checked good. Northstar asked me to sent the antenna to them. They bench tested and all is ok with the antenna. Now I call for the unit and they tell me it could be up to 20 business days before they can look at it. :smt013 Has anyone else had any problems with this exact unit?