Is it possible to use 2-way walkie talkie to locate position?

Basically, given no GPS is allowed, can we use walkie talkie to locate the position of a car / a person?

I am assuming the walkie talkie is using radio, not GPS-based.

What equipments will be required to capture the signals in and out to approximate the location (within 2 miles range)?

Thanks.

Actually, what is the best and cheapest way to locate the position (really, without GPS / mobile data plan).

Hi,
I dont know how, but i do know that you can find the position with a transmitter and 2 receivers using the method of triangulation (http://en.wikipedia.org/wiki/Triangulation). I guess that you do it by measuring the time it takes to travel the distance. I hope this helps a bit.
Boi

Yes it is. With one radio you can determine relative position but not distance by using a directional beam antenna. With two radios knowing the distance between them you can triangulate. Of course both radios need directional beam antennas. This is how aircraft navigation was done for may years but unlike two radios, there were multiple radio stations, just plain AM radio stations. The original aircraft navigation antenna were just big loops of wire and the navigator turned the loop to get a maximum signal. They did need to have a map that indicated exact station position.

Thanks for the detail answer. Well, this is a small hobby project. But let's supposed we have 2 cars moving, and we want to know how far they are away from the starting point, and send the data back to a server. Wifi is out of question as we don't have long range wifi support. Where should we place the 3 antenna stations? How do we know which signal is from which car? Thanks.

fyi, i also have a FM station running.

Are the two receivers fixed? If so that makes it easy. If not a bit more difficult. Do you know the law of sines (Wiki if not)? The receivers will determine the angles but you need at least on distance unless you can determine latitude down to seconds (even that may not be good enough).

This also involves using compasses on both ends. Even if you have two cars they can be tracked but you won't know who is who.

Take a look at these "GPS modules":http://www.laipac.com/gps-engine-board-module-receiver.htm from Laipac. This gets you GPS without having a dataplan. I used one of these modules once and there was a mode that constantly sent out location information and we read it with a microcontroller.

Basically, given no GPS is allowed, can we use walkie talkie to locate the position of a car / a person?

`Did you read this?

Thanks Earl. Actually, my apology to both of you. I thought we must need dataplan / wifi in order to transmit 2-way GPS signals.

Thanks. I will look into that

@Cody Miller,

Thanks. How much does it cost (from ur memory)? How is it transmitted? I am kinda a noob in this area as I do mostly programming. Does it actually require a GPS device?

Thanks to both of you.

You can combine a walkie-talkie and a bug to track pets. It turns out a device that can be used as a walkie-talkie with GPS. You can use the CX312 Walkie Talkie, I saw it in many reviews like http://thebestwalkietalkies.com/. Further on, radio electronics forums and a skillful approach to the situation