Keng-hūi-tō͘ (經緯けいい度ど), mā thang kiò chò tē-lí chō-piau-hē (地理ちり座標ざひょう系けい) ia̍h sī tē-lí chō-piau hē-thóng (地理ちり坐すわ標しるべ系統けいとう), sī iû keng-tō͘ kap hūi-tō͘ cho͘-sêng ê chi̍t ê chō-piau-hē.
