I believe that somehow my Longines Legends Diver got magnetized. When I bring it near my iPhone while the compass app is running, it starts to go crazy... when I move it away, the compass returns to normal. None of my other watches do that. The longines is also running really fast, it picked up several minutes overnight.

So 4 questions for you guys

1) is the iphone method reliable way to see if the watch is magnetized or should i get a real compass?

2) will the cheap blue-box demagnetizers found on amazon do the trick for me? i've never used one before, little confused as to how they work or if they even will work for this

3) could a watch winder be the culprit in causing the magnetization? none of my other watches who went in the same winder are doing the same thing, i tested them all

(edit) 4) Any risk to my other watches from being NEAR the LLD in a watch box while I wait for the demag device to arrive?


Thanks,
Dan