VLF Stations List

Here is a list of VLF transmitters suitable for SID monitoring. Unless otherwise stated, they transmit almost 24/7. Those stations are used either as a communication means with submarines or for time signal.

Note:
This list is a synthesis of several sources and may contain obsolete or erroneous information.
Do not hesitate to contact me for any addition or correction.

Last Update: 31 Jul 2023

Call sign	Notes	Frequency	Location	Latitude	Longitude	Aerial View
VTX1		16300	South Vijayanarayanam, India Locator: MJ88vj	N 08° 23' 13.25" (+08.387015°)	E 077° 45' 9.94" (+077.752762°)
JXN	⁽¹⁾	16400	Novik, Norway Locator: JP66wx	N 66° 58' 27.67" (+66.974353°)	E 013° 52' 25.02" (+013.873617°)
VTX2		17000	South Vijayanarayanam, India Locator: MJ88vj	N 08° 23' 13.25" (+08.387015°)	E 077° 45' 9.94" (+077.752762°)
SAQ	⁽²⁾	17200	Grimeton, Sweden Locator: JO67ec	N 57° 06' 47.42" (+57.113171°)	E 012° 23' 50.20" (+012.397277°)
RDL	⁽³⁾	18100	? Locator: ------	- --° --' --.--" (---.------°)	- ---° --' --.--" (----.------°)
VTX3		18200	South Vijayanarayanam, India Locator: MJ88vj	N 08° 23' 13.25" (+08.387015°)	E 077° 45' 9.94" (+077.752762°)
VTX4		19200	South Vijayanarayanam, India Locator: MJ88vj	N 08° 23' 13.25" (+08.387015°)	E 077° 45' 9.94" (+077.752762°)
GBZ		19580	Anthorn, UK Locator: IO84iv	N 54° 54' 41.91" (+54.911643°)	W 003° 16' 42.44" (-003.278456°)
NWC		19800	Harold E. Holt, North West Cape, Exmouth, Australia Locator: OG78be	S 21° 48' 58.78" (-21.816328°)	E 114° 09' 56.11" (+114.165586°)
ICV		20270	Isola di Tavolara, Italy Locator: JN40uw	N 40° 55' 23.26" (+40.923127°)	E 009° 43' 51.64" (+009.731011°)
FTA	⁽⁴⁾	16800 20900	Sainte-Assise, France Locator: JN18gn	N 48° 32' 40.68" (+48.544632°)	E 002° 34' 45.94" (+002.579429°)
NPM		21400	Lualualei, Maili, Oahu, HI Locator: BL01wk	N 21° 25' 12.60" (+21.420166°)	W 158° 09' 4.10" (-158.151140°)
HWU	⁽⁵⁾	15100 18300 19100 21750 22600	Rosnay, France Locator: JN06or	N 46° 42' 47.26" (+46.713129°)	E 001° 14' 42.89" (+001.245248°)
GQD		22100	Skelton, UK Locator: IO84nr	N 54° 43' 54.48" (+54.731799°)	W 002° 52' 58.92" (-002.883033°)
NDT		22200	Ebino, Japan Locator: PM52jb	N 32° 04' 55.50" (+32.082084°)	E 130° 49' 40.66" (+130.827960°)
DHO38	⁽⁶⁾	23400	Rhauderfehn, Germany Locator: JO33tb	N 53° 04' 44.04" (+53.078900°)	E 007° 36' 54.00" (+007.615000°)
NAA		24000	Cutler, ME Locator: FN64ip	N 44° 38' 41.77" (+44.644936°)	W 067° 16' 53.90" (-067.281639°)
NLK		24800	Oso Wash, Jim Creek, WA Locator: CN98ae	N 48° 12' 12.55" (+48.203487°)	W 121° 55' 0.58" (-121.916827°)
unid25		25000	Mokpo, South Korea Locator: PM34fq	N 34° 40' 44.65" (+34.679068°)	E 126° 26' 43.38" (+126.445383°)
NML	⁽⁷⁾	25200	La Moure, ND Locator: EN06ti	N 46° 21' 57.56" (+46.365990°)	W 098° 20' 8.30" (-098.335638°)
TBB		26700	Bafa, Turkey Locator: KM37pj	N 37° 24' 45.81" (+37.412725°)	E 027° 19' 24.03" (+027.323342°)
NRK/TFK		37500	Grindavik, Iceland Locator: HP83su	N 63° 51' 1.31" (+63.850365°)	W 022° 28' 0.38" (-022.466773°)
JJY-40	⁽⁸⁾	40000	Mount Ootakadoya, Fukushima prefecture, Japan Locator: QM07ki	N 37° 22' 21.35" (+37.372598°)	E 140° 50' 56.06" (+140.848906°)
SRC		40400	Varberg, Sweden Locator: JO67ec	N 57° 06' 47.42" (+57.113171°)	E 012° 23' 50.20" (+012.397277°)
NAU		40800	Aguada, Puerto Rico Locator: FK68jj	N 18° 23' 55.54" (+18.398762°)	W 067° 10' 39.36" (-067.177599°)
NSY		45900	Niscemi, Italy Locator: JM77fd	N 37° 07' 32.37" (+37.125660°)	E 014° 26' 11.10" (+014.436416°)
SXA		49000	Marathon, Greece Locator: KM28ad	N 38° 08' 42.61" (+38.145170°)	E 024° 01' 10.95" (+024.019709°)
GYW1		51950	Crimond, UK Locator: IO97bo	N 57° 37' 2.87" (+57.617464°)	W 001° 53' 15.34" (-001.887595°)
MSF	⁽⁹⁾	60000	Anthorn, UK Locator: IO84iv	N 54° 54' 40.30" (+54.911195°)	W 003° 16' 45.49" (-003.279302°)
WWVB	⁽¹⁰⁾	60000	Fort Collins, Colorado Locator: DN70lq	N 40° 40' 39.80" (+40.677722°)	W 105° 02' 49.75" (-105.047153°)
JJY-60	⁽¹¹⁾	60000	Mount Hagane, Fukuoka prefecture, Japan Locator: PM53cl	N 33° 27' 55.56" (+33.465433°)	E 130° 10' 31.49" (+130.175415°)
FUG		62600	La Régine, France Locator: JN13bj	N 43° 23' 12.47" (+43.386798°)	E 002° 05' 50.60" (+002.097388°)
FUE		65800	Kerlouan, France Locator: IN78tp	N 48° 38' 15.62" (+48.637672°)	W 004° 21' 2.61" (-004.350725°)
BPC	⁽¹²⁾	68500	Shangqiu, Henan Province, China Locator: OM74wk	N 34° 27' 23.47" (+34.456519°)	E 115° 50' 12.97" (+115.836937°)
CFH		73600	Halifax, Canada Locator: FN84ax	N 44° 58' 2.19" (+44.967276°)	W 063° 58' 55.78" (-063.982160°)
DCF77	⁽¹³⁾	77500	Mainflingen, Germany Locator: JO40ma	N 50° 00' 55.48" (+50.015411°)	E 009° 00' 29.90" (+009.008307°)
GYN2		81000	Inskip, UK Locator: IO83nt	N 53° 49' 48.26" (+53.830071°)	W 002° 50' 3.36" (-002.834266°)

Notes:
⁽¹⁾ : JXN is transmitting 6 times a day, each transmission 2 hours: 00:00-02:00, 04:00-06:00, 8:00-10:00, 12:00-14:00, 16:00-18:00, 20:00-22:00 UTC.
⁽²⁾ : Historic station only active twice-yearly on special occasions. SAQ website:
⁽³⁾ : Sporadic transmissions. Transmitter location varies and for most of them is unknown. Candidate sites are: Krasnodar; Nizhniy Novgorod; Arkhangelsk; Tashkent, Uzbekistan; Molodechno, Belarus; Kalinigrad.
⁽⁴⁾ : 16.8kHz is seldom used
⁽⁵⁾ : HWU alternates between 18.3kHz, 19.1kHz, 21.75kHz and 22.6kHz. 15.1kHz is seldom used
⁽⁶⁾ : Off-air daily from 7:00 to 8:00 UTC.
⁽⁷⁾ : Off-air on Tuesdays from 12:00 to 19:00 UTC.
⁽⁸⁾ : Time Signal. 50kW/12.5kW ERP. JJY-40 website:
⁽⁹⁾ : Time Signal. 17kW ERP. MSF website:
⁽¹⁰⁾ : Time Signal. 65kW ERP. WWVB website:
⁽¹¹⁾ : Time Signal. 50kW/22.5kW ERP JJY-60 website:
⁽¹²⁾ : Time Signal. Active 0000-2100 UTC. BPC website:
⁽¹³⁾ : Time Signal. 30KW ERP. DCF77 website:

Here are some KML files of the above transmitters. These files can be viewed using Google Earth.
In order to get updates to those files, give Google Earth the link and not a local copy of the kml file.

VLF transmitters		(application/vnd.google-earth.kml+xml, 31Kb, 31 Jul 2023)
Time Signal transmitters		(application/vnd.google-earth.kml+xml, 14Kb, 23 May 2013)

Other VLF Stations

For information, here are lists of other transmitters operating in the VLF or LF frequency range.
They usually cannot be used for SID monitoring: several transmitters could share the same frequency or a given transmitter could use several frequencies. Moreover, some of those satations are off air.

Alpha (RSDN-20) is a Russian system for long range radio navigation. It operates on the frequencies: 11904.76190, 12648.80952, 14880.95238, 14881.09127, 12090.77381 and 12044.27083 Hz.
A location is determined by the phase difference between the received signals.
The OMEGA was a radio navigation system for aircraft. The system consisted in 8 stations, operating between 10 and 14 kHz. Omega was stopped on September 30, 1997.
A location is determined by the phase difference between the received signals.
LORAN is also a radio navigation system. It operates from 90 to 110 kHz. A similar system, called Chayka (seagull in English) is interoperable with LORAN and is in use in Russia.
A location is determined by the time interval between the received signals.

In order to get updates to those files, give Google Earth the link and not a local copy of the kml file.

ALPHA (RSDN-20) transmitters		(application/vnd.google-earth.kml+xml, 1Kb, 01 Apr 2012)
Former OMEGA transmitters		(application/vnd.google-earth.kml+xml, 3Kb, 10 Dec 2010)
LORAN-C transmitters		(application/vnd.google-earth.kml+xml, 56Kb, 10 Dec 2010)