Further to the comments already posted on this:
1) From Mavin (www.mavin.com/slickitems)
2) These things work just fine (I have two in operation)
3) They don't talk NMEA, but I have a PIC project which will hopefully
do the conversions, as do others
4) Check out Tim Laren's most excellent site which is dedicated to
projects around this unit.  Tim has done an outstanding job.
http://gps.instanet.com

Tim's site has references to the PIC based solutions.
Have fun

/Kevin
--
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Kevin J. Maciunas           Net: kevin@cs.adelaide.edu.au
Dept. of Computer Science   Ph : +61 8 8303 5845
University of Adelaide      Fax: +61 8 8303 4366
Adelaide 5005
SOUTH AUSTRALIA