Even non magnetic metal can cause interference for the watch. Big ships for example, also have a magnetic compass, but due to the vast size of the ship (metal) it will cause interference for the compass.
Probably you beeing in a car causes interference I think.
Even non magnetic metal can cause interference for the watch. Big ships for example, also have a magnetic compass, but due to the vast size of the ship (metal) it will cause interference for the compass.
Probably you beeing in a car causes interference I think.