 Kosmos 2501 is a satellite, which was built by ISS Reshetnev based on the Ekspress-1000A satellite bus.The spacecraft has three-axis stabilisation to keep it in the correct orientation, and will broadcast signals in the L1, L2 and L3 navigation bands for Russian military and commercial users.In addition to its navigation payloads, the satellite also carries a Cospas-Sarsat search and rescue payload.