GW2 Sonic Periscopes can be found throughout the following areas – Diessa Plateau, Wayfarer Foothills, Snowden Drifts, Plains of Ashford, Iron Marches. Once you destroy the Sonic Periscope, search the Sonic Periscope Wreckage to collect Sonic Periscope Audio Log. On the map look for the Vigil Audio Log Collector and give him the logs. In return you will gain 100 karma. The periscopes reset daily. Locations are the same for all servers.
When you come close to the Sonic Periscope you will hear a strange sound like ringing in your ears, and your character will have a red circle aura.
It’s evil, in a bad way, they they require you to find 50 of these things–without a way to track them. I am glad they are trying to expand the game in a meaningful way, but I still think that the post-development team continues to let the players down.
(Yes, you can locate them, but they respawn–without records inside.)