devtrackers.gg
Hi,after spending about 20 hours exploring the city with purpose, finally got almost all collectibles, not counting dz comms still missing 3 comms (new york missing 1, outcasts missing 1, unknows missiong 1)and 2 world echos,hope this would help you. will update if I find the rest. (Added timestamps as @ThirdEchelon suggested.)
The Division 2 - All Government Comms
https://youtu.be/SaQVv5kUOMA
The Division 2 - All Theater Comms Location
https://youtu.be/MyiO9z3aLZc
The Division 2 - All True Sons Comms Location
https://youtu.be/a4T6xPPv_Os
The Division 2 - All Contaminated Comms Location
https://youtu.be/1ENFBNRZRxw
The Division 2 - All Campus Comms Location
https://youtu.be/iz6Djo3fwJI
The Division 2 - All Castle Comms Location
https://youtu.be/3YsY2VeDS-M
The Division 2 - All Dead Drops Comms
https://youtu.be/q2ZGwz1hp_w
The Division 2 - All Division Comms
https://youtu.be/ipxZLHoQkYo
The Division 2 - All Hyenas Comms
https://youtu.be/qVfi6NBVeMs
The Division 2 - All JTF Comms Location
https://youtu.be/nguKmhKqM4A
The Division 2 - All Shay Comms Location
https://youtu.be/hP2Xiav7ziE
The Division 2 - All Factions ECHOs Location
https://youtu.be/3Ba92BMc4ho
The Division 2 - All Unknown ECHOs Location
https://youtu.be/ViDjqX8c63c
The Division 2 - All Artwork Artifacts Location
https://youtu.be/PIRMHAPejK4
The Division 2 - All Founding Fathers Artifacts Location
https://youtu.be/7FGjucXPO-w