Anemometer snowed/iced up

[steve]

But the Cumulus wind direction graph has been showing North from the time the anemometer stopped

The instantaneous bearing shows zero when (apparently) calm if you have the option to do that selected. The average bearing will always show zero when calm, as it takes speed into account.

[Gina]

Thanks for your reply Steve I though it was something like that. However, that option is unchecked.