The United States sells advanced GPS jammers

China and Russia sell GPS jammers. Some of the latest Russian GPS jammers have recently been deployed in eastern Ukraine. In 2007, China introduced a powerful GPS jam system for trucks. These "GPS jammers" are designed to form a protective bubble in the area where the truck is located. Sales are slow. A year before the invasion of Iraq in 2003, it is believed that Saddam had purchased a large number of GPS jammers to counter the US JDAM GPS smart bombs. It's no secret that JDAM has a backup INS. The GPS jamming work in Iraq did not have a substantial impact on the 2003 campaign.

Although the US military has not encountered too many (if any) GPS failures on the battlefield, the threat still exists. The most obvious evidence comes from North Korea, which has a long history of manufacturing, selling and using GPS jammers. In 2012, North Korea launched a comprehensive GPS jamming activity against South Korea. The power outage started in early 2012 and lasted for more than two weeks. It was confirmed in less than a day that the signal came from North Korea, mainly the South Korean capital (Seoul). The interference has little effect on the city itself (ground interference signals are blocked by buildings and hills), only hundreds of planes taking off and landing from the local airport, and about a hundred ships operating at sea have noticed it. In all these cases, ships and aircraft have backup navigation systems, which are activated when GPS is no longer reliable. This is how navigation systems are designed, especially those based on external signals (satellites). This is the third time North Korea has used GPS Jammer against South Korea. For most of March 2011, North Korea sent GPS jamming signals to Seoul. A separate gsm jammer targets mobile phone traffic.

GPS jamming signals can be detected 100 kilometers south of the DMZ. This is the third time North Korea has used GPS interference against South Korea. For most of March 2011, North Korea sent GPS jamming signals to Seoul. A separate jammer targets mobile phone traffic. GPS jamming signals can be detected 100 kilometers south of the DMZ. This is the third time North Korea has used GPS interference against South Korea. For most of March 2011, North Korea sent GPS jamming signals to Seoul. A separate jammer targets mobile phone traffic. GPS jamming signals can be detected 100 kilometers south of the DMZ.