I have a VX2 that I just placed an updated C-Map chip in. The unit won't display new way points now and has trouble when the range is increased. I spoke to furuno and they suggest a software update. The unit serial is 4326-5701. The program displayed on the display unit test ends in 01.07. What software updates do I need? If it is more then one must they be done in increments or can I go right to the latest? Where do I get these updates? I'm assuming I will need several 2gb SD cards. How would i go about backing up my way points and other info. before I perform the update(s). thanks in advance.