NAVAID Series
Non-Directional Beacon
無方向性信標臺
Non-Directional Beacon (NDB) is a radio transmitter at a known location, used as an aviation navigational aid (NAVAID). As the name implies, the signal transmitted does not include inherent directional information. NDBs used for aviation should be operated on a frequency between 190 kHz and 1750 kHz. Each NDB is identified by a one, two, or three-letter Morse code callsign.
無方向性信標臺（NDB）是一種設於固定位置的無線電發射臺，是一種航空用助導航設施（NAVAID）。由名稱可知，NDB提供的信號是沒有方向的資訊的。 在航空中使用的NDB規定必須操作在190kHz至1750kHz之間。每一個NDB都會有一個用1至3個英文字母所組成的摩斯碼呼號。
One of the uses of NDB in aviation navigation is the "locator" for an instrument landing system (ILS) approach. Just like the lighthouse for the harbor, locator tells aircrafts where the runway is.
NDB其中一種航空助導航用途為儀器降落系統（ILS）的「定位臺」。就像是港口的燈塔，定位臺告訴航機要降落的跑道位置。
For cache hunting, please fellow the descrition below:
請由下列敘述尋寶：
1. The listed coordinates are not final location of this geocache. It's located at the forbidden area. PLEASE DO NOT ENTER. There is a locator at the listed coordinates. Please find its operational frequency (ABCD kHz).
1.以上所列的座標並非是寶點。此座標位於管制區中，請勿進入。此座標所在地為一定位臺，請找到它的發射頻率為ABCD kHz。
2. Trun on your radio receiver (or by some other methods), and you will find the Morse code callsign of this locator. Please write down the tatal number of dots (E) or dashes (F).
2.打開您的收音機聽取這個頻率，您會聽到此定位臺的摩斯碼呼號（或是用其他方法找到它的摩斯碼呼號），請算一下總共是E個短音（dot）與F個長音（dash）。
And the final coordinates are
而最終寶點位於
N 22° B(D+E).(B+C)(E+F)A
E 120° (E-C)(B+E+F).(B+C+F)FC
PLEASE ATTENTION: DO NOT PROVIDE SOLUVING METHOD IN YOUR LOG AND DO NOT POST ANY IMAGE OR INFORMATION ABOUT THE REAL CACHE SITE. THE OWNER WILL DELETE ABUSING LOG WITHOUT INFORMING.
請注意：不要提供解題的方法於log中，也不要貼出任何與寶點有關的訊息與照片。違規的log將會於不知會的狀況下刪除。
PLEASE BRING YOUR OWN PEN.
請帶您的筆來。