As time advances,
Moore's Law and improved satellite imaging will at some point enable us to make the query:
In this <geographical area> find this <RGB backpack color value> plus or minus <some color value> sized smaller than <some area value> and greater than <some area value> that <is> or <is not> moving.Add in the potential benefits of a better
Fossett hive mind search and within the decade we just might be able to resolve this search problem from the comfort of our home offices.
In a day or so. Even if the lost soul doesn't carry a GPS transponder.