GRI 8000
Identification
The record most plausibly identifies GRI 8000, the European CHAYKA (RSDN-3/10) terrestrial radionavigation chain rather than a single transmitter site. A 2019-2024 CIS radionavigation plan describes it as a 100 kHz pulse-phase long-range system for aircraft, ships, and land users, and a 1988 FAA coverage diagram independently labels the Western U.S.S.R. chain as GRI 8000. ([intermedia.ru](https://www.intermedia.ru/uploads/8a39d4.pdf))
Placemark match
The four supplied placemarks closely match open-source locations for the chain’s M/W/X/Y transmitters: Karachev near Bryansk (master), Petrozavodsk, Slonim, and Simferopol. The Karachev point also aligns with an ISW map entry for a “Chayka Radio-technology System for Distant Navigation” at 53.12807N, 34.90966E. ([aef.se](https://www.aef.se/FHT-dokument/RT_02.pdf))
Chain composition
Open sources are not fully consistent on the full GRI 8000 roster. The FAA’s 1988 diagram and later technical references show a five-station chain that also includes Syzran, while the supplied metadata lists only four stations and omits that site; the 2019 CIS plan likewise states that the European chain has five stations, but the accessible text fragment does not fully reconcile the station order. ([rosap.ntl.bts.gov](https://rosap.ntl.bts.gov/view/dot/70896/dot_70896_DS1.pdf))
Capabilities
Russian technical material distinguishes RSDN-3/10 as the European CHAYKA chain with long antenna feeders, indicating fixed purpose-built LF transmission sites. In the 2019-2024 CIS plan, the European chain is credited with roughly 1,500-1,900 km range and 0.5-2 km position accuracy, with propagation corrections improving accuracy by about 2-3 times in many areas. ([allgosts.ru](https://allgosts.ru/33/060/gost_r_53168-2008))
Operational relevance
Open planning documents describe CHAYKA as an autonomous reserve navigation system and as a means of transmitting timing and service information, making GRI 8000 relevant as a non-satellite backup PNT layer. The latest authoritative planning source located for this review is the 2019-2024 CIS plan, so current 2026 readiness of individual GRI 8000 transmitters is not publicly confirmed in the sources reviewed. ([intermedia.ru](https://www.intermedia.ru/uploads/8a39d4.pdf))