美国开发出一款完全不发光就能悄悄为士兵指引方向的高科技背带。这款指南针背带内置微型马达、传感器、各种振荡器和数字罗盘,能与全球定位仪GPS连接在一起,准确辨别东、南、西、北、东南、西南、东北、西北8个方向。对这8个方向,背带内都有相对应的振动器进行振动。举例 The United States has developed a high-tech straps that can quietly guide the soldiers without any light. This compass strap with built-in micro-motor, sensors, various oscillators and digital compasses can be connected with the GPS global positioning device to accurately identify the east, south, west, north, southeast, southwest, northeast and northwest 8 directions. The eight directions, the strap has a corresponding vibrator vibration. For example