I have developed a device that uses gps to send it's location. Now I'm looking to add something that is a little more definite in terms of locating it. For instance, the gps will get me to within 100 meters of the object. From that point I need to "home in" on it to withing 20 feet or so. I was thinking about using some sort of RF transceiver that, when I got close, I could get "pings" from and it would increase in strength the closer I got. This would be a sort of treasure hunt.
Can anyone direct me towards a through-hole mounted rf transceiver or has anyone ever attempted something like this already?? So far, I can only find SMD RF Transceivers.
For that matter, is this even possible or am I barking up the wrong tree with the RF transceiver thing as a homing device??