WeatherFlow Tempest Quick Instruction Manual page 6

The blue arrow on the side of the device should face true north or true north
and the solar panels aligned south for optimal sun exposure. If your station is in
the Southern Hemisphere, point the arrow south with the panels aligned north.
Tempest devices configured in the Southern Hemisphere will automatically
receive a 180 ° wind direction correction via the software.
True or geographic north / south is not the same as magnetic north / south. A
compass will point towards the magnetic poles. Geographical north / south is the
true center point of a hemisphere and is the basis for referring to wind direction.
A compass can help you align your Tempest, but you need to adjust the compass
reading with your magnetic declination. An easy way to accurately align the
device is to find a north or south landmark on the map when locating the station
and use it to align the arrowhead. For example, the side of your house or any
landmark you can see that gives you a clue to a known cardinal direction.
6
https://weatherflow.com/