1. A system installed on a host aircraft for enhancing flight safety of the host aircraft, the system comprising: a. means for receiving an adjustment value from a portable memory device; b. means for determining a working value of a parameter in accordance with a combination of the adjustment value and an existing value of the parameter, the parameter describing other than terrain and expected climb gradient; and c. means for threat avoidance that provides an advice in accordance with the working value of the parameter.