Anyone out there in P2V land that has experience with Survey GPS? My plans are to be covering construction of a large Hydroelectric project over the next 7 years. On a previous project I was introduced to a fairly new technology that utilized a number of GPS ground stations placed around the site on land based benchmarks that were described to me as GPS repeaters. They were mounted on a heavy duty tripod and self powered with battery/solar. My question is, could these effect or possibly jam the P2V GPS system and cause a fly away.