Sirf has come up with GPS on a chip transponders. Are there
manufactures or service providers of tracking technology for humans? I
am looking for a list for a wearable products that transmit location
and can be accesed via web or another handheld tracking location.
Please provide a list of products to achieve this goal.

Hi! Thanks for the question.
Right now it seems only few products are out there. Here are the
wearable tracking device products I was able to find.
Blu-Tag
http://www.stopllc.com/products.cfm#blutag 
Electronic Entities
http://www.eeontheweb.com/personal_gps_location.htm
Wherify
http://www.wherifywireless.com/html/solutions.asp?pageId=47 
WearNet
http://www.poc.com/emerging_products/wearnet/default.asp 
Global Pet Finder – (Used for pets but obviously humans can wear them too)
http://www.globalpetfinder.com/ 
Guardian Lion
http://www.guardianlion.com/
Pocket Tracker
http://www.byonics.com/pockettracker/ 
iSureTrac
http://www.isecuretrac.com/products_detail.asp?focus=Transmitter 
Garmin Foretrex 201
http://www.garmin.com/products/foretrex201/ 
FitSense
http://www.fitsense.com/b/ProjectPortfolio.asp 
Global Sat (Uses Sirf Chips)
http://www.globalsat.com.tw/english/products_detail.php?main_id=21&p_id=157 
CATS COMMUNICATION
http://www.catscommunication.com/news/3.htm 
Geta Sandals with RFID (Experimental Stage)
http://tecfa.unige.ch/perso/staf/nova/blog/2005/09/20/knowing-where-you-walk-to/ 
Search terms used:
wearable people employees personnel kids children bracelet tracker gps
I hope these links would help you in your research. Before rating this
answer, please ask for a clarification if you have a question or if
you would need further information.
Regards,                              
Easterangel-ga                              
Google Answers Researcher

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Request for Answer Clarification by bill22-ga on 25 Feb 2006 15:30 PST

good list but thought there would be much more and more devices geared
for tracking small children (those under 5). I am assumng that those
are not commercially produced I should have asked for that in the
question but thought it would be inluded in the list. Can you please
see if your answer could be more specific to this request.

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Clarification of Answer by easterangel-ga on 26 Feb 2006 14:16 PST

Hi!
Usually researchers only work on the original premise and in this case
requirements for small children and even devices in the experimental
stage were not mentioned.
However, I still tried to find some products or even studies. But it
seems that there really isn't much out there at the moment. Maybe it
would be good to look into this in a few more months or years since at
the moment, the functional and even experimental technology is quite
limited.
Best Regards,
Easterangel-ga

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Clarification of Answer by easterangel-ga on 28 Feb 2006 00:31 PST

Thank you for understanding and for the generous tip! :)

this was a good list I was dissapointed at the level of technology in
the list which makes me suspicious that there is more hidden out their
given the fact the actual chip size for gos is quite small and thus a
smaller tracking device would be possible and desired by so many.
Perhaps a custom manufacuter.

if your trying to keep track of someone (ie your child) who has a
mobile phone then there are loads of services you can sign up to that
will let you know their location for a fee. google on "mobile phone
tracking" or something similar