The classified military signal of GPS is reputed to have an accuracy of one metre. If, over a segment of its flight, the INS of a long-range missile builds up an error, the GPS military signal can be referenced to correct it. However, accessing the GPS military signal requires a country to sign BECA.
Signing BECA would also allow India to receive advanced navigational aids and flight management systems for several types of aircraft procured from the US, including the C-17 Globemaster III, C-130J Super Hercules and the P8-I Poseidon.
BECA would also allow India to exchange mapping data with the US to support a particular defence system or weapon to produce aeronautical and nautical charts or to conduct joint hydrographic surveys in uncharted areas.