1. A simulation device for training equipment for a real ground vehicle, comprising: a vehicle model comprising a predetermined number of function models for simulation of corresponding physical function elements of said vehicle; arrangements for engaging physical function elements to the simulation device, wherein the simulation device is arranged such that a function model concerning a determined function element is configured to be deactivated at engagement of corresponding physical function elements and such that the deactivated function model is reactivated at disengagement of said engaged function element.