Re: DDT tools
Yes, there are newer casrtridges. Anytime the ECM changes, the cartridge changes.
The DDT is probably the most expensive system you could find. The TechMate (also Rinda) does the same thing without all the cartridges. Not as big a display, but the same functions are displayed and used. Slower, but a lot less expensive. If you have a laptop you can read in the sun, the proper cables and the $700+ for the software, you can go for the big gun (Diacom)
http://www.rinda.com/marine/marine.htm
Just remember one thing. Any of the information shown on any of those tools only gives you the information, you still have to interpret it and make sense of it all. There is no EZ button to hit that reaches out and slaps you up side the head and says "Do This Dummy".