App ok - device is junk
I received the device from Amazon today and have tested it several times throughout the day and find the device very inaccurate and does not respond to wind changes very well. This is a day when winds have been between 5-15 mph. The cups didnt want to even rotate in the light stuff and measured 5-6 mph when I know from experience (30+ sailing years) that it was blowing at least 10 mph. And on top of the inaccuracy, it seems very cheaply made for the money... Returning product to Amazon and deleting the app.
Harry Highstone about
Vaavud Wind Meter