A famous incident involving a passenger plane that strayed from its INS guided flight path was the shootdown by the Soviets of [[Korean Airlines Flight 007]], shot down west of Sakhalin Island in 1983. Either the pilots had failed to switch from Magnetic Heading to INS or did so out of the maximum range of 7 1/2 Nautical Miles from the "desired track". This mistake may have lead to the shootdown itself. It was due to KAL 007's deviation from its route while using INS that President Reagan authorized GPS to be used for non-military navigational purposes | A famous incident involving a passenger plane that strayed from its INS guided flight path was the shootdown by the Soviets of [[Korean Airlines Flight 007]], shot down west of Sakhalin Island in 1983. Either the pilots had failed to switch from Magnetic Heading to INS or did so out of the maximum range of 7 1/2 Nautical Miles from the "desired track". This mistake may have lead to the shootdown itself. It was due to KAL 007's deviation from its route while using INS that President Reagan authorized GPS to be used for non-military navigational purposes |