Make a rfid plaster, stick it on your kid [not too sick], make a portable tracking device usable in the zoo, park or whatever place kids always manage to get lost (e.g. especially in groups managed by their teacher).
Half baked is the tracking device, rfid needs active scanning I believe (any ideas on that?).
GPS/WifI plasters might be better with a Wifi PDA as tracking device.If the fun park has Internet WiFi even parents at home could track & trace where the PDA publishes the kids whereabouts data to a webserver. Guess w've got to wait a couple of years so the gps/wifi plaster is implementable :-)
A bonus idea is that the park could set up warning gps parameters for danger (water, traffic, etc) that trigger alerts.
PS: The extra your get with GPS/WiFi on top of 'Theme Park Leash' is that you can track your kid also outside the controled spaces.-- missionimpossible, Aug 03 2004 Findware http://www.findware...tracking_device.htmI'm not googless ... there's some stuff out there but not in plaster form. [missionimpossible, Oct 04 2004, last modified Oct 21 2004] From the HB archives: Kidnapping ankle bracelets http://www.halfbake...20ankle_20braceletsCirca Jan 02: It's [susen]'s but no plaster. [bristolz, Oct 04 2004] From the HB archives: Lojac for Kids http://www.halfbake.../Lojac_20for_20KidsCirca Nov 02. Nope, no plaster here, either. [bristolz, Oct 04 2004] From a HB search for "plaster" with "bandaids" http://www.halfbake...0Sticking_20PlasterFor algophobes and non-anglophiles. [dpsyplc, Oct 04 2004] Take a wireless web cam and sick [sic] it on your kid, and you won't even have to *bother* finding him.-- phundug, Aug 03 2004 I seem to recall that [susen] had a similar (good) idea, but it, along with her account, is long gone.[Edit]: I was wrong, as [bz] has linked. I spelled [Susen]'s name with a lower case initial.-- angel, Aug 03 2004 I prefer those spring-loaded retractable dog-leads, myself.-- lostdog, Aug 03 2004 random, halfbakery