Favorites let you see a brief forecast and current wind conditions. You can add to Favorites any spot or weather station.

Add a few spots and weather stations to Favorites to compare them.
You can add any spot to Favorites.

To do so, press the star in the top right corner of the screen. The spot will now appear on the app's main screen. You won't have to search for it again.

You can remove a spot from Favorites the same way, just press the star again and it will become transparent.