Article 10442 of rec.aviation.marketplace:
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From: Hank Blackstock <w5hj@ionet.net>
Newsgroups: rec.aviation.marketplace
Subject: Re: garmin 90 database update
Date: Sun, 09 Feb 1997 06:35:21 -0600
Organization: Internet Oklahoma
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J.Masino/T.Larson wrote:
> 

> fact that asking for the disk is probably illegal, unless it can be proven
> that the original owner never used it.  

The way the update works, if the orginal owner has used it it is then
usless to update any GPS except the one it was orignally used on. The
reason they make it reusable for one gps is one might want to change
back and forth from Europe to U. S. database. During the update the
computer checks the serial number of the GPS and encodes it somehow on
the disk.

This is not to say that there isn't a way around it. It only keeps the
honest people honest.

Hank