Tap the position icon to the left of the message field to send a position.
NOTE: You can manually enter any earth position using the format xx.x,yyy.y where x is latitude in degrees and fractions of a degree and y is longitude in degrees and fractions of a degree. Preface latitude with a minus sign (-) if in the southern hemisphere and longitude with a minus sign (-) if in the western hemisphere.
That's it! You will receive your forecast with in a minute or two.