A memory unit mounting module is provided for an on-board vehicle navigation device. The memory unit mounting module includes a memory unit and a support plate inside a housing of the navigation device and absorbing means arranged between the support plate and the memory unit for protecting the memory unit against shock and/or vibration, The absorbing means includes at least one spring element that may support the memory unit, and at least one damping element for absorbing shock and/or vibration of the memory unit.