卫星导航往往只能在大范围内使用，本程序可以实现小范围内模拟GPS导航，由于主要侧重于核心功能，所以目前输出模式采用控制台（用控制台的字符出图像！）-The GPS systems are always been used as a large area guider,but not fit in small area such as company and school,this program can immitate the GPS system and can be used as a g