Radio Direction Finding (DF) is not something that is impossible to do. In fact is it is a big hobby for some people. Check out the page of of Amateur Radio Direction Finding enthusist, Joe Moell. I was amused by the strange efforts of Sayid on this week's LOST. If the transmitter is not moving, take a line of bearing (LOB), move and get another LOB. Better record these some how, maybe on a map. Pretty soon you can see where all the LOBs intersect and you have a FIX. The FIX is an area where the transmitter probably is. (Sometimes you get it wrong.) Its the same principle of resection with a compass. Equipment that automatically figures the FIX is three or more recievers taking reading togethers. The LOB from one radio is transmitted to a station that calculates where the FIX was on a computer.
1. Where was the map, electronic or paper, that was going to be used for the DF?
2. How were these walkie-talkie radios going to transmit their data? If you could transmit data, what was it going to transmit? Sayids radios could show a general LOB, but there was nothing that he was carrying that could figure a FIX through automation.
3. How were they calculating the location of the radios with no maps? Maps are key to DF.
4. By the way, they do need to find that French transmitter because it has an awesome power source. What is powering that thing?
With no map and radios that just showed the highest power reading of the reciever, probably one would be better off just walking, take a reading and walk and take a reading. Soon you it would be able to find the strongest LOB and start walking it. Recheck occationally to keep you on course. If you find the strongest signal behind you, you just passed it!