No, the TZT doesn't use C-map chart cards. It uses one type of chart called MM3 (MapMedia 3D). They do offer areas using C-map or Navionics data cores for purchase but the TZT is a totally different animal. It is rare to see someone have both units on the same boat and when they do, they normally are using the GP1870 as a sounder. C-map can sell C-map core MM3 licences to charts for the TZT. You might see if you can get a package deal from them since you are looking at buying charts for both systems.