Can you open https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf from mainland China?
Sometimes.
Access is unreliable — 100% of the last 1 conclusive tests showed interference.
Access cdn.oceanservice.noaa.gov with GreatFireVPN →Frequently asked questions
Is https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf blocked in mainland China right now?
As of the last test on 2026-08-18, https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf is 100% disrupted in mainland China, based on GreatFire's live Great Firewall measurements.
Why is https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf blocked in mainland China?
Access is unreliable — 100% of the last 1 conclusive tests showed interference.
Since when has https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf been blocked?
GreatFire has recorded interference with https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf from mainland China since 2026-08-18.
How can I access https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf from mainland China?
You need a circumvention tool such as a VPN. GreatFireVPN, built by GreatFire, is designed to bypass the Great Firewall and reach sites like cdn.oceanservice.noaa.gov.
https://cdn.oceanservice.noaa.gov/oceanserviceprod/education/tutorial_currents/lessons/currents_tutorial.pdf · JSON