Abstract: The Ships Navigation Aircraft Inertial Alignment System (SNAIAS) Digital t Set checks-out the data link navigation messages between the shipboard navigation system and the aircraft inertial alignment system. The test set monitors alignment and waypoint data, and provides a go/no-go indication of the adequacy of the data. The set receives transmitted UHF data by means of a receiver, or hardwired data from the Alignment Outlet Boxes (AOB) via a cable connector. SNAIAS can also monitor data at other hardwired points along the data distribution path. The test set monitors either the AOB data, the RF data, or sequentially monitors each. The set can generate its own data, inject it into the data path, and monitor the system outputs.