Maybe it exists already?
Each morning I watch the Hot Air Balloons navigate olong the the horizon. Their only real control is a very slow up, or down. That is, the ability to go to a height that has a wind the direction the pilot wants. Must be from memory the pilots note wind direction and speed at the various altitudes, so they can extend their flights without ending up in Nevada.
What they could use is a light weight, simply indicating wind vs altitude indicator. That way they have some idea of whether it's worthwhile to 'punch through' a fast moving unwanted layer going the wrong way to another layer going the right way. WITHOUT the need for the pilot to empiricially find the right wind current.
Any ideas of a sensor capable of this?
Even the display is a challenge.
Needs to be portable, light weight, unbreakable [well at least not pose a hazard if it breaks] with a sensitivity range of ??, 2000 feet?