In the blog post, When Tankers Collide: How to Defend Against GNSS Disruption at Sea, Oscilloquartz emphasizes the growing necessity of resilient timing infrastructure to counter rising GNSS spoofing incidents.
GNSS spoofing and jamming are not merely technical nuisances, they are active tools in modern electronic warfare and pose direct threats to national defense, as well as commercial shipping. State and non‑state actors have deployed spoofing in contested waters, particularly the Black Sea and Baltic region, to mislead vessels, obscure ship movements, or conceal sensitive operations
At the heart of GNSS vulnerabilities lies timing. Spoofing technologies manipulate satellite timestamps, which receivers rely on to calculate position. Even slight alterations in signal timing can produce false location data, leading to navigational errors. Oscilloquartz points to enhanced primary reference time clocks (ePRTCs) as a critical safeguard. These systems establish an independent, stable time base using cesium clocks, which allows maritime systems to continue operating reliably when satellite inputs are disrupted.
Importantly, ePRTCs support anomaly detection. When incoming GNSS data deviates from the trusted timing baseline, systems can recognize discrepancies before errant information is used, helping to preserve the integrity of navigation displays like ECDIS and AIS. In port, Precision Time Protocol (PTP) over fiber can also be used as a backup time source, blending with satellite signals when available.
Training scenarios that simulate GNSS loss and confirm continued system synchronization are part of Oscilloquartz’s recommended approach. This multi-layered strategy provides maritime operators with a modern equivalent of a spare compass: ensuring continuity in an environment where trusted timing is becoming as critical as the satellite signals themselves.
