There have been ex-MOD radiosondes for sale on Ebay UK for a while now and
there seems to have been no shortage of buyers (and least one person who
seems to bid on them all). Some of them include a GPS receiver, though not
a
fully featured one - it reports only how much it's moved rather than where
it is. The GPS versions fetch a higher price than the ones without so
presumably there's something you can actually use these modules for. Does
anyone know what?

Perhaps I should buy one rather than risk being the only Radio Amateur in
my
street without my own radiosonde....
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These units are probably useful if you are interested in equipping yourself
with a (mobile) APRS or UI-View system.
However ,beware! Ensure that you get hold of info (if not included with the
hardware) how to interface them.
Also beware of 'e-bay fever'. Goods sold on e-bay often fetch higher
prices than identical equipment sold through the official trade channels.

Frank GM0CSZ / KN6WH