GMP meaning in Sports ?

Gresham Motorsports Park (formerly Jefco Speedway, Georgia International Speedway and Peach State Speedway) is a half-mile (.8 km) paved oval auto racing track in Jefferson, Georgia. The track opened in 1967, named Jefco Speedway. Tom Pistone won the inaugural event, a NASCAR Late Model Sportsman race. Two NASCAR Grand National races were held at the track in 1968 and 1969, won by Cale Yarborough and Bobby Isaac. Since 1983, the track has held the World Crown 300 for late model stock cars. The track was renamed Peach State Speedway in the early 1990s. The circuit was renamed and extensively renovated in 2009. NASCAR started running K&N Pro Series East races in 2010.