
Flying into Mexico now requires a 406MHz emergency locator transmitter to be installed in an aircraft. The Mexican government required the use 406 MHz as of July 2009. There is a lot of very remote and rugged terrain all over Mexico and the use of the new ELTs will ensure that an aircraft will be found if it goes down over Mexico. 406 MHz is far advanced from that of the old 121.5 MHz. The advantages are so many that the Mexican government decided (along with ICAO) to implement the use of 406 MHz over the entire country.