Ilmital, daɣ Sidney illan ti 200 n metir (700 n atkul) izlaynen jir isalan win GPS wa ehan GDA ( iknan fal standard WGS 84 wan alɣalim) d AGD ( exaddaman hullan i karti tan tin akal) harat eqqalan tajjarzazzal maqqorat i aplikasyon tan iyyad chund win eket n iddikud meɣ ajarw n edag s alamaɣ daɣ aman