With the introduction of terrain awareness and advisory products that were not certified for the Class A or B TAWS mandate, clarification was needed to properly categorize all other non-TAWS products. Some manufacturers advertise products with &TAWS-like& or &terrain advisory& features. These details sometimes confused and misled consumers. Class C TAWS refers to terrain awareness intended for aircraft not affected by any TAWS mandate. Some aircraft owner/operators may desire some of the features and functions found in certified Class B TAWS products but do not need to go through the FAA approval process. This might also be common for aircraft operating in VFR conditions. Class C TAWS products achieve terrain advisories in the same manner that Class B products do (i.e. GPS position georeferenced against terrain database). The displays for Class C TAWS products look very similar if not the same as Class B products. However, because Class C is not mandated, the use of aural alerts and certain warnings/annunciations is not required.