[someweirdperson]

A small inconsistency: The "i"nfo button claims it is also converting Kelvin, but those don't seem to be displayed. Kelvin is not degrees, probably the info text is wrong.

Could the compass get the magnetic heading from the browser on mobile?

[perilunar]

There's more info in landscape mode. (I should add that to the info)

Yes, possibly. There's a webkit extension but I'm not sure how well it's supported. I'll look into it.