On Thu, 30 Sep 2010 23:34:53 +0800 Zhang Weiwu <zhangweiwu@realss.com> wrote: <snippy> > So if any one came across such a device can you give me a hint? > > * It should come in pair, one stick/bind on the thing to be > tracked, the other have a radar screen to find its partner. It is not > even necessary have a radar screen, a wrist-watch-like or compass-like > mechanical pointer thing would do. > * If it works outdoor it's enough. No need to use indoor. > * If it can find the 'partner' in 150 meters it's good enough. 300 > meter even better. Longer not needed. > * Both are movable, not fixed on the wall. > * The information it provides should be close to real-time, update > once per 15 seconds would be enough. > > Thanks in advance for suggestions and tolerance of off-topic posts. > <snippy> Here are some things that might do; [1] 183M (ish) less without LoS [2] same kind of thing, less range though. [3] Lots of products, lists the same one as the first one, with a few others, none seem to get 300 meters, best seems to be 183 meters [4] This does just what you want, up-to 500 meters, 2s update, accurate to within 10m but it costs $490.0 USD, ouch! [5] Loud beep, works upto 150 meters, there are lots of different ones like this, google keywords: Child locator, Child Tracking I think the Loc8or Plus (item [1]) is about as close to what you wanted within a reasonable price tag, shame that its only 150Meters though! [1] http://www.babysecurity.co.uk/products/2077/Loc8tor-Plus-Homing-Tracker-Locator-%26-Personal-Panic-Alarm.html (UK link) or http://www.brickhousesecurity.com/child-locator.html (US link) [2] http://www.ion-kids.com/buy.html [3] http://www.peopletracking.co.uk/index.php [4] http://www.redwolfairsoft.com/redwolf/airsoft/ProductDetail?prodID=28201 [5] http://www.mypreciouskid.com/child-locator.html ------ Regards, Angus Hedger Debian GNU/Linux User PGP Public Key 0xEE6A4B97
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