Wifi broadcasting Chip?

I don't really know what you are asking.  What is the end goal?

The end goal would be able to use a cell phones built in wifi to locate the chip when its within range, or notifiy the cell phone of its x,y coordinates are in the world.

gps does this just fine.

Are you saying a GPS Antenna?

a gps module with an Antenna.

The problem here is that for say a phone or tablet to pick it up you would be using either WIFI or Bluetooth since these are already included with the phone. A more power efficient solution for this simplistic app would be a small 433MHZ transmitter module and a small low power controller to squark out the unique code but you would then need to make a reciever for the whole thing which is more involved.

Probably the simplist way of doing this would be  a Bluetooth module and acontroller to send the ID then pair with it and the phone.

The BT modules are around the £3++ range depending on where you get them from and the exact spec,

Personally I would go for my solution above if you are doing more than one or two devices ...would make acool project !

Basically a low-jack that you phone/tablet can trace...

Bluetooth and 433MHZ transmitter wouldn't be able to trace it's location world wide...

F/S

I'm not sure because he has not stated what is application is but since he mentioned WIFI I would say that the application is well with in the 100M range often quoted for WIFI lets be honest a 10M distance is more likely 433MHz parts would be very good for that.

Also you may want a combonation of methods because if it can be sensed too far away it would be difficut to locate as you got closer and it just deafened your reciever?!

I agree with you on using wireless transmitters. But he asks for world wide tracking.

I've had the same kind of idea!

My pondering ended up with the following;

A smartphone already has by standard:

Bluetooth

Wifi

GPS

Cellphone-ish features...

So, I thought of a mesh-like function.

Data traffic travels via cell towers, we can use that data to triangulate somewhat within what district we are in.

GPS gives us a more fixed pos. It's what it was built for!

But, with wifi and bluetooth, we could handshake between smartphones, and establish links inbetween and with several phones, make our own triangulatory (yes, I might just have made that word up..) positioning system, that could also ask 'around' - who got a data connection active? The one that has, replies - I do! - and that data stream is then used, over low range BT or Wifi.

Of course, this would need a backend service somewhere on the interwebs, and the wording "there's an app for that" might not hold true to the max.. But, hey - thinkering is our thing, right? .

Hope my rambling gave some new ideas!