GPS Repeaters

GPS is widely used to guide aircraft and direct emergency vehicles. However, GPS does not work indoors and when aircraft or vehicle GPS based systems are being checked, they need a GPS signal in order to operate. GPS Repeaters retransmit a signal taken from an external GPS antenna and allow maintenance on GPS based systems to be carried out indoors.

GPS Repeaters and Re-transmitters

GPS Repeaters and Re-transmitters
GPS Source