Kestrel Wind Speed Meter | Pocket Weather Meters | Free Shipping
, They make weather stations.
You either plug in your altitude and use the sea level corrected density given on
the weather channels or , as with a kestrel, leave alt. shut off in your program and
enter your actual pressure reading. the short of it.
There is a icon in the upper rt corner of the hud settings that should dial up and get the weather for you on an iphone. I use a ipod so no love for me.