Here's the deal, my 1823C unit is in the shop right now having it's software updated. BTW, my unit is less than a year old and it is
8 versions behind
Latest NavNet Software versions are:
C-Map - version 19
Navionics - version 15
The latest version of both increased the redraw rate by 150%, according to the Furuno tech that I spoke to last week.
According to my local Furuno dealer (New York Marine Electronics, Port Jefferson, NY), the software upgrade must be done by a certified technician or directly by Furuno. Some Furuno resellers, like the one I bought all my electronics from (Consumers Marine Electronics) does not have a certified tech to do the upgrade, so they recommend that you send it back to Furuno. However the local dealer, who doesn't know me from a hole in the wall, said that he can do it and as Furuno policy there is no charge for the upgrade

While I was in his shop he also said that he will match anyone's price on Furuno equipment - guess who's getting all my future business.