看Garmin官网上的发布，
United States Air Force selects Garmin® D2 Charlie aviator watch
说是美国空军将会给U2飞行员提供100支D2 Charlie航空表，
以作为驾驶舱内的备份GPS设备。
Garmin International, Inc. a unit of Garmin Ltd. (NASDAQ: GRMN), today announced that the D2™ Charlie aviator watch has been selected by the United States Air Force (USAF) for use by the pilots of the Lockheed U-2 aircraft. The high-sensitivity WAAS GPS-enabled D2 Charlie aviator watch incorporates global navigation capability, rich and colorful moving maps and more, providing pilots in the USAF with an exclusive, back-up navigation timepiece in the cockpit.
With a service ceiling of 70,000 feet, the D2 Charlie will provide unique benefits such as barometric-based O2 alerting and GPS-specific features including track, distance to the next waypoint, estimated time enroute and more.
按照上面的说法，D2 Charlie可以在7万英尺高空提供气压高度警告，GPS航路，到下一导航点的距离和时间等信息。
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U2是上个世纪冷战时代的一款著名侦察机（间谍机），
21世纪它还在服役之中，真是没有想到。
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