One hr late as stated in the article. As a detectorist myself, I can verify that if the coil does not pass over the object, it will not be detected. Even the direction of the swing can affect detection. Swing one way, nothing. Swing 90 degrees out, bingo. Pretty much like looking for a needle in a haystack. As for the detector not working he stated that the screen was fading. Most machines have an audible alert. The screen was probably for discrimination purposes. Many detectorists can give an educated guess what has been detected merely by the sound.
One hr late as stated in the article. As a detectorist myself, I can verify that if the coil does not pass over the object, it will not be detected. Even the direction of the swing can affect detection. Swing one way, nothing. Swing 90 degrees out, bingo. Pretty much like looking for a needle in a haystack. As for the detector not working he stated that the screen was fading. Most machines have an audible alert. The screen was probably for discrimination purposes. Many detectorists can give an educated guess what has been detected merely by the sound.