How Geocaching Works
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Move yourself to the coordinates and call somebody by phone.
Tell him your location. The task is, that your friend has to find the webcam in the web and download a picture of you holding a sign with your account name on it (for example my account name is Snuffel). Please make sure that the sign is big enough to be readable on the photo. The task is fulfilled when your photo is uploaded on your log.
(No hints available.)