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The P-1 is built by Kawasaki Heavy Industries for Japan's Self-Defense Forces. It is the country's first purely domestically made anti-submarine patrol plane.
The plane has color radar screens, making it easier to detect and track the movements of suspicious vessels. The new aircraft's sonobuoy, a device used to gather acoustic data and locate submarines, also offers higher performance.
The P-1's capability is much greater than the P-3's. For example, the P-1 is a jet, while the P-3 is a propeller plane. The P-1's maximum speed is about 30% faster than the P-3's. The P-1 also has a longer range of some 8,000km, compared with the P-3's approximately 6,600km.
The U.S. military is now stepping up its surveillance activities in the South China Sea, flying the P-8 state-of-the-art maritime patrol aircraft, in response to China's moves to build military footholds on reclaimed land there.
But it will not be easy for the U.S. military, which does not have a permanent base in the South China Sea, to continue such activities over the long term and on its own.
That is why there are growing expectations in the U.S. of cooperation with Japan's SDF, which is now preparing to fully introduce the P-1.
originally posted by: JIMC5499
The P-8 does not have a Magnetic Anomaly Detector (MAD) system. They couldn't add one without having to redesign the aircraft.