I went for a short walk yesterday afternoon mostly through forest tracks with some open areas. My Garmin Etrex 20 showed I had climbed 304,894 m. All the rest of the data such as horizontal distance, time taken, seemed normal.
There is a communications mast with a plethora of dishes, antennae, etc on top of the hill I was climbing. Snow started falling about half way up and continued to end of walk. It got quite heavy towards the end.
Which is more likely to have caused the false reading -the snow or the mast?