Stupid ? , but was thinking how you go about this , i think i have seen beacons out they that have a smaller beacon ( snow bug ) on your sled the has a different signal. I have the ortovox S1 and dont think they offer this .
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good metal detector should work
If it's an XP you will need a tin-foil detector.
The snobug only works with the SOS-SB beacon and it transmits on a completely different frequency. I would think the only way other than what was suggested above (spring ) or metal detector would be to organize a probe line.