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The Garmin Approach S1 is still usable, and is often used in the USA.
It's not too old, either - though a reasonable number have failed to operate since it was released, judging by the questions I have taken.
As for an update for the S1 model... I am looking that up for you. I will post again with results (if any) in several minutes.
The latest operating software update for the S1 was released in 2012.
(Did you mean, map updates?)
Here's the page for it:
Note that if you use Garmin Express software to apply the update, you will get whatever map updates there are, also, by using CourseUpdater too. See that page for further information.
Does this answer your question completely? Do you need further information on this ?