both frequencies. The 121.5 frequency is still used for honing in on final approach by rescue aircraft. Of course it is not the primary frequency.
The 406 uses the satellite system so that rescue can be activated.
Its true that PLB's using 121.5 only are obsolete.
Kayak & Canoe Outriggers
Touring Kayak Paddles
Pull-Up Strap Handle Kit
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