diff --git a/src/anetz/Makefile.am b/src/anetz/Makefile.am
index 9cbfefa..a043a42 100644
--- a/src/anetz/Makefile.am
+++ b/src/anetz/Makefile.am
@@ -6,6 +6,7 @@ bin_PROGRAMS = \
 anetz_SOURCES = \
 	anetz.c \
 	dsp.c \
+	stations.c \
 	image.c \
 	main.c
 anetz_LDADD = \
diff --git a/src/anetz/main.c b/src/anetz/main.c
index 1276304..4e73f0a 100644
--- a/src/anetz/main.c
+++ b/src/anetz/main.c
@@ -33,6 +33,7 @@
 #include "../common/besetztton.h"
 #include "anetz.h"
 #include "dsp.h"
+#include "stations.h"
 #include "image.h"
 
 /* settings */
@@ -43,6 +44,10 @@ void print_help(const char *arg0)
 {
 	print_help_common(arg0, "");
 	/*      -                                                                             - */
+	printf(" -g --geo <lat>,<lon>\n");
+	printf("        Give your coordinates of your location, to find closest base station.\n");
+	printf("	(e.g. '--geo 51.186959,7.080194') Or use '--geo list' to get a list of\n");
+	printf("        all base station locations.\n");
 	printf(" -P --page-sequence 0 | <ms>\n");
 	printf("        Cycle paging tones, rather than sending simultaniously.\n");
 	printf("        (default = '%d')\n", page_sequence);
@@ -56,14 +61,16 @@ void print_help(const char *arg0)
 static int handle_options(int argc, char **argv)
 {
 	int skip_args = 0;
+	char *p;
 
 	static struct option long_options_special[] = {
+		{"geo", 1, 0, 'g'},
 		{"page-sequence", 1, 0, 'P'},
 		{"loss", 1, 0, '0'},
 		{0, 0, 0, 0}
 	};
 
-	set_options_common("P:0:", long_options_special);
+	set_options_common("g:P:0:", long_options_special);
 
 	while (1) {
 		int option_index = 0, c;
@@ -74,6 +81,18 @@ static int handle_options(int argc, char **argv)
 			break;
 
 		switch (c) {
+		case 'g':
+			if (!strcasecmp(optarg, "list")) {
+				station_list();
+				exit(0);
+			}
+			if ((p = strchr(optarg, ','))) {
+				get_station_by_coordinates(atof(optarg), atof(p + 1));
+				exit(0);
+			}
+			fprintf(stderr, "Invalid geo parameter\n");
+			exit(0);
+			break;
 		case 'P':
 			page_sequence = atoi(optarg);
 			skip_args += 2;
diff --git a/src/anetz/stations.c b/src/anetz/stations.c
new file mode 100644
index 0000000..1b5bc50
--- /dev/null
+++ b/src/anetz/stations.c
@@ -0,0 +1,271 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+static struct anetz_stations {
+	const char	*standort;
+	int		kanal21; /* Channel for prefix 21 */
+	int		kanal22; /* Channel for prefix 22 (0 = use previous channel) */
+	int		kanal23; /* ... */
+	int		kanal24;
+	int		kanal25;
+	const char	*coordinates;
+} anetz_stations[] = {
+/*	  Standort			Prefix 21..25 	Coorinates */
+	{ "Niebuell",			32, 0, 0, 0, 0,	"54o47 08o50" },
+	{ "Flensburg",			39, 0, 0, 0, 0,	"54o47 09o26" },
+	{ "Schleswig",			35, 0, 0, 0, 0,	"54o31 09o34" },
+	{ "Kiel",			36, 0, 0,38, 0,	"54o20 10o08" },
+	{ "Toenning",			37, 0, 0, 0, 0,	"54o19 08o57" },
+	{ "Heide",			34, 0, 0, 0, 0,	"54o12 09o06" },
+	{ "Eutin",			30, 0, 0, 0, 0,	"54o08 10o37" },
+	{ "Neumuenster",		32, 0, 0, 0, 0,	"54o04 09o59" },
+	{ "Luebeck",			37, 0, 0,42, 0,	"53o52 10o41" },
+	{ "Cuxhaven",			30, 0, 0, 0, 0,	"53o52 08o41" },
+	{ "Hemmoor",			40, 0, 0, 0, 0,	"53o42 09o08" },
+	{ "Ratzeburg",			40, 0, 0, 0, 0,	"53o42 10o45" },
+	{ "Hamburg",			39,35,31,41,33,	"53o34 10o00" },
+	{ "Bremerhaven",		39, 0, 0,41, 0,	"53o33 08o35" },
+	{ "Wilhelmshaven",		36, 0, 0, 0, 0,	"53o31 08o08" },
+	{ "Aurich",			32, 0, 0, 0, 0,	"53o28 07o29" },
+	{ "Lueneburg",			32, 0, 0, 0, 0,	"53o15 10o25" },
+	{ "Leer",			35, 0, 0, 0, 0,	"53o14 07o27" },
+	{ "Oldenburg",			30, 0, 0,31, 0,	"53o09 08o13" },
+	{ "Rotenburg",			30, 0, 0, 0, 0,	"53o06 09o24" },
+	{ "Bremen",			37,44,33,42, 0,	"53o05 08o48" },
+	{ "Soltau",			35, 0, 0, 0, 0,	"52o59 09o50" },
+	{ "Luechow",			30, 0, 0, 0, 0,	"52o58 11o09" },
+	{ "Uelzen",			34, 0, 0, 0, 0,	"52o58 10o33" },
+	{ "Werlte",			34, 0, 0, 0, 0,	"52o51 07o41" },
+	{ "Hoya",			32, 0, 0, 0, 0,	"52o48 09o08" },
+	{ "Lingen",			36, 0, 0, 0, 0,	"52o31 07o19" },
+	{ "Berlin",			39,33,35,41, 0,	"52o31 13o23" },
+	{ "Wolfsburg",			30, 0, 0, 0, 0,	"52o25 10o47" },
+	{ "Hannover",			36,44,33,38, 0,	"52o22 09o43" },
+	{ "Osnabrueck",			39, 0, 0,41, 0,	"52o17 08o03" },
+	{ "Minden",			30, 0, 0,40, 0,	"52o17 08o55" },
+	{ "Braunschweig",		37, 0, 0,42, 0,	"52o16 10o31" },
+	{ "Burgsteinfurt",		37, 0, 0, 0, 0,	"52o09 07o21" },
+	{ "Bielefeld",			34,33, 0,43, 0,	"52o01 08o31" },
+	{ "Alfeld",			39, 0, 0, 0, 0,	"51o59 09o50" },
+	{ "Muenster",			32, 0, 0,42, 0,	"51o58 07o38" },
+	{ "Kleve",			32, 0,31,38, 0,	"51o47 06o08" },
+	{ "Paderborn",			37, 0, 0, 0, 0,	"51o43 08o46" },
+	{ "Wesel",			45, 0, 0, 0, 0,	"51o40 06o37" },
+	{ "Goettingen",			34, 0, 0, 0, 0,	"51o32 09o56" },
+	{ "Dortmund",			36, 0, 31,38,0,	"51o31 07o28" },
+	{ "Essen",			34, 0, 0, 0,43,	"51o27 07o01" },
+	{ "Duisburg",			39,44,33,41, 0,	"51o26 06o46" },
+	{ "Meschede",			35, 0, 0, 0, 0,	"51o21 08o17" },
+	{ "Kassel",			32, 0, 0, 0, 0,	"51o19 09o30" },
+	{ "Wuppertal",			30, 0, 0, 0,40,	"51o16 07o11" },
+	{ "Korbach",			38, 0, 0, 0, 0,	"51o17 08o52" },
+	{ "Luedenscheid",		39, 0, 0, 0, 0,	"51o13 07o38" },
+	{ "Winterberg",			33, 0, 0, 0, 0,	"51o12 08o31" },
+	{ "Duesseldorf",		37, 0, 31,42,0,	"51o14 06o47" },
+	{ "Eschwege",			39, 0, 0, 0, 0,	"51o11 10o03" },
+	{ "Koeln",			36,35,33,38, 0,	"50o56 06o57" },
+	{ "Siegen",			36, 0, 0, 0, 0,	"50o53 08o01" },
+	{ "Aachen",			34, 0, 0, 0, 0,	"50o47 06o05" },
+	{ "Alsfeld",			36, 0, 0,40, 0,	"50o45 09o16" },
+	{ "Bonn",			32, 0, 0,41, 0,	"50o44 07o06" },
+	{ "Dillenburg",			42, 0, 0, 0, 0,	"50o44 08o17" },
+	{ "Giessen",			34, 0, 0, 0, 0,	"50o35 08o40" },
+	{ "Fulda",			30, 0, 0, 0, 0,	"50o33 09o41" },
+	{ "Montabaur",			46, 0, 0, 0, 0,	"50o26 07o50" },
+	{ "Usingen",			30, 0, 0, 0, 0,	"50o20 08o32" },
+	{ "Mayen",			34, 0, 0, 0, 0,	"50o20 07o13" },
+	{ "Hof",			39, 0, 0, 0, 0,	"50o19 11o55" },
+	{ "Coburg",			35, 0, 0, 0, 0,	"50o16 10o58" },
+	{ "Boppard",			39, 31,0, 35,0,	"50o14 07o35" },
+	{ "Koblenz",			40, 0, 0, 0, 0,	"50o22 07o36" },
+	{ "Pruem",			35, 0, 0, 0, 0,	"50o12 06o25" },
+	{ "Gelnhausen",			41, 0, 0, 0, 0,	"50o12 09o10" },
+	{ "Wiesbaden",			30, 0, 0, 0,40,	"50o05 08o14" },
+	{ "Hanau",			39, 0, 0, 0, 0,	"50o08 08o55" },
+	{ "Frankfurt",			37,35,31,42,33,	"50o07 08o41" },
+	{ "Schweinfurt",		34, 0, 0, 0, 0,	"50o03 10o14" },
+	{ "Aschaffenburg",		45, 0, 0, 0, 0,	"49o58 09o09" },
+	{ "Bingen",			36, 0, 0,41, 0,	"49o58 07o54" },
+	{ "Bayreuth",			30, 0, 0, 0, 0,	"49o57 11o35" },
+	{ "Bernkastel",			37, 0, 0, 0, 0,	"49o55 07o04" },
+	{ "Bamberg",			37, 0, 0, 0, 0,	"49o54 10o54" },
+	{ "Darmstadt",			32, 0, 0,38, 0,	"49o52 08o39" },
+	{ "Marktheidenfeld",		36, 0, 0, 0, 0,	"49o51 09o36" },
+	{ "Wuerzburg",			39, 0, 0,44, 0,	"49o47 09o56" },
+	{ "Pegnitz",			34, 0, 0, 0, 0,	"49o45 11o34" },
+	{ "Trier",			39, 0, 0, 0, 0,	"49o45 06o38" },
+	{ "Kitzingen",			32, 0, 0, 0, 0,	"49o44 10o10" },
+	{ "Idar-Oberstein",		32, 0, 0, 0, 0,	"49o43 07o19" },
+	{ "Lindenfels",			34, 0, 0, 0, 0,	"49o41 08o47" },
+	{ "Weiden",			32, 0, 0, 0, 0,	"49o40 12o09" },
+	{ "Mannheim",			39,35,44,41, 0,	"49o29 08o28" },
+	{ "Fuerth",			44, 0, 0, 0, 0,	"49o28 11o00" },
+	{ "Kaiserslautern",		34, 0, 0,43, 0,	"49o27 07o46" },
+	{ "Nuernberg",			39, 0, 33,41,0,	"49o27 11o05" },
+	{ "Heidelberg",			37, 0, 0,42, 0,	"49o25 08o43" },
+	{ "Ansbach",			30, 0, 0, 0, 0,	"49o18 10o35" },
+	{ "Neumarkt",			35, 0, 0, 0, 0,	"49o17 11o28" },
+	{ "Saarbruecken",		30, 0, 0,40, 0,	"49o14 07o00" },
+	{ "Heilbronn",			32, 0, 0,43, 0,	"49o09 09o13" },
+	{ "Schwaebisch Hall",		41, 0, 0, 0, 0,	"49o07 09o44" },
+	{ "Weissenburg",		36, 0, 0, 0, 0,	"49o02 10o58" },
+	{ "Regensburg",			30, 0, 0, 0, 0,	"49o01 12o05" },
+	{ "Karlsruhe",			30, 0, 0, 0,40,	"49o01 08o24" },
+	{ "Pforzheim",			46, 0, 0, 0, 0,	"48o54 08o43" },
+	{ "Deggendorf",			37, 0, 0, 0, 0,	"48o50 12o58" },
+	{ "Schwaebisch Gmuend",		34, 0, 0, 0, 0,	"48o48 09o48" },
+	{ "Stuttgart",			35,44,33,38,40,	"48o47 09o11" },
+	{ "Calw",			31, 0, 0, 0, 0,	"48o43 08o44" },
+	{ "Geislingen",			35, 0, 0, 0, 0,	"48o37 09o50" },
+	{ "Passau",			36, 0, 0, 0, 0,	"48o34 13o28" },
+	{ "Landshut",			34, 0, 0, 0, 0,	"48o32 12o09" },
+	{ "Pfaffenhofen",		32, 0, 0, 0, 0,	"48o32 11o31" },
+	{ "Tuebingen",			37, 0, 0, 0, 0,	"48o31 09o03" },
+	{ "Offenburg",			32, 0, 0,38, 0,	"48o28 07o56" },
+	{ "Freudenstadt",		39, 0, 0, 0, 0,	"48o28 08o25" },
+	{ "Pfarrkirchen",		35, 0, 0, 0, 0,	"48o25 12o55" },
+	{ "Ulm",			39, 0, 0,41, 0,	"48o24 09o59" },
+	{ "Augsburg",			37, 0, 0,42, 0,	"48o22 10o54" },
+	{ "Rottweil",			34, 0, 0,43, 0,	"48o10 08o37" },
+	{ "Riedlingen",			33, 0, 0, 0, 0,	"48o09 09o28" },
+	{ "Muenchen",			39,35,33,41,44,	"48o08 11o34" },
+	{ "Wasserburg",			36, 0, 0,42, 0,	"48o03 12o14" },
+	{ "Freiburg",			37, 0, 0,31, 0,	"47o59 07o51" },
+	{ "Donaueschingen",		37, 0, 0, 0, 0,	"47o57 08o30" },
+	{ "Neustadt",			30, 0, 0, 0, 0,	"47o55 08o13" },
+	{ "Weilheim",			30, 0, 0, 0, 0,	"47o50 11o09" },
+	{ "Ravensburg",			30, 0, 0, 0, 0,	"47o47 09o37" },
+	{ "Singen",			31, 0, 0, 0, 0,	"47o46 08o50" },
+	{ "Bad Toelz",			37, 0, 0, 0, 0,	"47o46 11o33" },
+	{ "Kempten",			34, 0, 0,43, 0,	"47o44 10o19" },
+	{ "Bad Reichenhall",		41, 0, 0, 0, 0,	"47o43 12o53" },
+	{ "Loerrach",			44, 0, 0, 0, 0,	"47o37 07o40" },
+	{ "Saeckingen",			34, 0, 0, 0, 0,	"47o33 07o57" },
+	{ "Garmisch-Partenkirchen",	36, 0, 0, 0, 0,	"47o30 11o05" },
+	{ NULL, 0, 0, 0, 0, 0, NULL }
+};
+
+double lat_from_coordinates(const char *string)
+{
+	if (strlen(string) != 11)
+		abort();
+	if (string[0] < '0' && string[0] > '9')
+		abort();
+	if (string[1] < '0' && string[1] > '9')
+		abort();
+	if (string[2] != 'o')
+		abort();
+	if (string[3] < '0' && string[3] > '9')
+		abort();
+	if (string[4] < '0' && string[4] > '9')
+		abort();
+
+	return	(double)(string[0] - '0') * 10.0 +
+		(double)(string[1] - '0') +
+		(double)(string[3] - '0') / 6.0 +
+		(double)(string[4] - '0') / 60.0;
+}
+
+double lon_from_coordinates(const char *string)
+{
+	if (strlen(string) != 11)
+		abort();
+	if (string[6] < '0' && string[6] > '9')
+		abort();
+	if (string[7] < '0' && string[7] > '9')
+		abort();
+	if (string[8] != 'o')
+		abort();
+	if (string[9] < '0' && string[9] > '9')
+		abort();
+	if (string[10] < '0' && string[10] > '9')
+		abort();
+
+	return	(double)(string[6] - '0') * 10.0 +
+		(double)(string[7] - '0') +
+		(double)(string[9] - '0') / 6.0 +
+		(double)(string[10] - '0') / 60.0;
+}
+
+#define EQUATOR_RADIUS  6378137.0
+#define POLE_RADIUS     6356752.314
+
+#define PI              M_PI
+
+void station_list(void)
+{
+	int i;
+
+	printf("List of all base stations:\n");
+	for (i = 0; anetz_stations[i].standort; i++) {
+		printf("%s (%.2f° N %.2f° E)\n", anetz_stations[i].standort, lat_from_coordinates(anetz_stations[i].coordinates), lon_from_coordinates(anetz_stations[i].coordinates));
+	}
+}
+
+/* convert geo coordinates (lon/lat) to space coordinates in meters (x/y/z) */
+static void geo2space(double *x, double *y, double *z, double lat, double lon)
+{
+	*z = sin(lat / 180.0 * PI) * POLE_RADIUS;
+	*x = sin(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
+	*y = -cos(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
+}
+
+/* calculate distance */
+static double distinspace(double x1, double y1, double z1, double x2, double y2, double z2)
+{
+	double x = x1 - x2;
+	double y = y1 - y2;
+	double z = z1 - z2;
+
+	return sqrt(x * x + y * y + z * z);
+}
+
+
+int get_station_by_coordinates(double lat, double lon)
+{
+	double dist, min = 0.0;
+	int i, min_i = 0;
+	double x, y, z;
+	double s_lat, s_lon;
+	double s_x, s_y, s_z;
+	int kanal[5];
+
+	geo2space(&x, &y, &z, lat, lon);
+
+	for (i = 0; anetz_stations[i].standort; i++) {
+		s_lat = lat_from_coordinates(anetz_stations[i].coordinates);
+		s_lon = lon_from_coordinates(anetz_stations[i].coordinates);
+		geo2space(&s_x, &s_y, &s_z, s_lat, s_lon);
+		dist = distinspace(x, y, z, s_x, s_y, s_z);
+		if (i == 0 || dist < min) {
+			min = dist;
+			min_i = i;
+		}
+	}
+
+	/* don't allow distance more than 100KM */
+	if (min > 100000) {
+		fprintf(stderr, "Given coordinates are more than 100 km away from base station.\n");
+		return 0;
+	}
+	kanal[0] = anetz_stations[min_i].kanal21;
+	kanal[1] = anetz_stations[min_i].kanal22;
+	kanal[2] = anetz_stations[min_i].kanal23;
+	kanal[3] = anetz_stations[min_i].kanal24;
+	kanal[4] = anetz_stations[min_i].kanal25;
+
+	for (i = 0; i < 5; i++) {
+		if (i && kanal[i] == 0)
+			kanal[i] = kanal[i - 1];
+	}
+
+	printf("Closest base station: %s (distance = %.2f km)\n", anetz_stations[min_i].standort, min / 1000.0);
+	printf("Frequencies allocated in your area were:\n");
+	for (i = 0; i < 5; i++)
+		printf("  Channel %d for phone numbers '%dxxxxx'\n", kanal[i], i + 21);
+
+	return 0;
+}
+
diff --git a/src/anetz/stations.h b/src/anetz/stations.h
new file mode 100644
index 0000000..ddfba91
--- /dev/null
+++ b/src/anetz/stations.h
@@ -0,0 +1,4 @@
+
+void station_list(void);
+int get_station_by_coordinates(double lat, double lon);
+
diff --git a/src/bnetz/Makefile.am b/src/bnetz/Makefile.am
index 8cbe388..7966a59 100644
--- a/src/bnetz/Makefile.am
+++ b/src/bnetz/Makefile.am
@@ -6,6 +6,7 @@ bin_PROGRAMS = \
 bnetz_SOURCES = \
 	bnetz.c \
 	dsp.c \
+	stations.c \
 	image.c \
 	ansage.c \
 	main.c
diff --git a/src/bnetz/main.c b/src/bnetz/main.c
index 27d9132..c625672 100644
--- a/src/bnetz/main.c
+++ b/src/bnetz/main.c
@@ -33,6 +33,7 @@
 #include "../common/besetztton.h"
 #include "bnetz.h"
 #include "dsp.h"
+#include "stations.h"
 #include "image.h"
 #include "ansage.h"
 
@@ -45,8 +46,11 @@ void print_help(const char *arg0)
 {
 	print_help_common(arg0, "");
 	/*      -                                                                             - */
-	printf(" -g --gfs <gruppenfreisignal>\n");
+	printf(" -g --gfs <gruppenfreisignal> | <lat>,<lon>\n");
 	printf("        Gruppenfreisignal\" 1..9 | 19 | 10..18 (default = '%d')\n", gfs);
+	printf("        Alternative give your coordinates of your location, to find closest\n");
+	printf("        base station. (e.g. '--gfs 54.487291,9.069993') Or use '--gfs list' to\n");
+	printf("        get a list of all base station locations.\n");
 	printf(" -P --pilot tone | positive | negative | <file>=<on>:<off>\n");
 	printf("        Send a tone, give a signal or write to a file when switching to\n");
 	printf("        channel 19. (paging the phone).\n");
@@ -67,6 +71,7 @@ void print_help(const char *arg0)
 static int handle_options(int argc, char **argv)
 {
 	int skip_args = 0;
+	char *p;
 
 	static struct option long_options_special[] = {
 		{"gfs", 1, 0, 'g'},
@@ -87,7 +92,16 @@ static int handle_options(int argc, char **argv)
 
 		switch (c) {
 		case 'g':
-			gfs = atoi(optarg);
+			if (!strcasecmp(optarg, "list")) {
+				station_list();
+				exit(0);
+			}
+			if ((p = strchr(optarg, ','))) {
+				gfs = get_station_by_coordinates(atof(optarg), atof(p + 1));
+				if (gfs == 0)
+					exit(0);
+			} else
+				gfs = atoi(optarg);
 			skip_args += 2;
 			break;
 		case 'P':
diff --git a/src/bnetz/stations.c b/src/bnetz/stations.c
new file mode 100644
index 0000000..10b0ad5
--- /dev/null
+++ b/src/bnetz/stations.c
@@ -0,0 +1,295 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+static struct bnetz_stations {
+	const char	*standort;
+	int		gfs;
+	const char	*coordinates;
+} bnetz_stations[] = {
+/*	  Standort			GFS 	Koorinaten */
+	/* Germany */
+	{ "Flensburg",			8,	"54o47 09o26" },
+	{ "Bredstedt",			2,	"54o37 08o58" },
+	{ "Eckernfoerde",		5,	"54o28 09o50" },
+	{ "Kiel",			6,	"54o20 10o08" },
+	{ "Heide",			7,	"54o12 09o06" },
+	{ "Eutin",			2,	"54o08 10o37" },
+	{ "Neumuenster",		1,	"54o04 09o59" },
+	{ "Luebeck Nord",		5,	"53o54 10o38" },
+	{ "Cuxhaven",			6,	"53o52 08o41" },
+	{ "Luebeck Sued",		8,	"53o52 10o41" },
+	{ "Kaltenkirchen",		4,	"53o50 09o58" },
+	{ "Hemmoor",			8,	"53o42 09o08" },
+	{ "Hamburg",			9,	"53o34 10o00" },
+	{ "Bremerhaven",		2,	"53o33 08o35" },
+	{ "Wilhelmshaven",		1,	"53o31 08o08" },
+	{ "Emden",			9,	"53o22 07o12" },
+	{ "Zeven",			5,	"53o18 09o17" },
+	{ "Lueneburg",			7,	"53o15 10o25" },
+	{ "Leer",			3,	"53o14 07o27" },
+	{ "Oldenburg",			8,	"53o09 08o13" },
+	{ "Bremen",			7,	"53o05 08o48" },
+	{ "Uelzen",			4,	"52o58 10o33" },
+	{ "Luechow",			3,	"52o58 11o09" },
+	{ "Werlte",			2,	"52o51 07o41" },
+	{ "Bergen",			2,	"52o49 09o58" },
+	{ "Hoya",			3,	"52o48 09o08" },
+	{ "Vechta",			6,	"52o44 08o17" },
+	{ "Lingen",			7,	"52o31 07o19" },
+	{ "Berlin Nord",		1,	"52o31 13o23" },
+	{ "Berlin Sued",		2,	"52o30 13o23" },
+	{ "Wolfsburg",			5,	"52o25 10o47" },
+	{ "Hannover",			8,	"52o22 09o43" },
+	{ "Osnabrueck",			4,	"52o17 08o03" },
+	{ "Minden",			5,	"52o17 08o55" },
+	{ "Braunschweig",		1,	"52o16 10o31" },
+	{ "Burgsteinfurt",		3,	"52o09 07o21" },
+	{ "Hildesheim",			7,	"52o09 09o57" },
+	{ "Bielefeld",			7,	"52o01 08o31" },
+	{ "Alfeld",			6,	"51o59 09o50" },
+	{ "Muenster",			6,	"51o58 07o38" },
+	{ "Kleve",			4,	"51o47 06o08" },
+	{ "Recklinghausen",		5,	"51o35 07o10" },
+	{ "Wesel",			8,	"51o40 06o37" },
+	{ "Uslar",			4,	"51o40 09o38" },
+	{ "Soest",			2,	"51o34 08o07" },
+	{ "Goettingen",			5,	"51o32 09o56" },
+	{ "Warburg",			3,	"51o30 09o10" },
+	{ "Dortmund",			1,	"51o31 07o28" },
+	{ "Essen",			7,	"51o27 07o01" },
+	{ "Duisburg",			9,	"51o26 06o46" },
+	{ "Meschede",			8,	"51o21 08o17" },
+	{ "Kassel",			7,	"51o19 09o30" },
+	{ "Wuppertal",			3,	"51o16 07o11" },
+	{ "Luedenscheid",		4,	"51o13 07o38" },
+	{ "Duesseldorf",		2,	"51o14 06o47" },
+	{ "Eschwege",			9,	"51o11 10o03" },
+	{ "Schmallenberg-Dorlar",	5,	"51o08 08o18" },
+	{ "Bad Wildungen",		1,	"51o07 09o07" },
+	{ "Koeln",			5,	"50o56 06o57" },
+	{ "Biedenkopf",			8,	"50o55 08o32" },
+	{ "Siegen",			7,	"50o53 08o01" },
+	{ "Bad Hersfeld",		2,	"50o52 09o42" },
+	{ "Dueren",			6,	"50o48 06o29" },
+	{ "Aachen",			4,	"50o47 06o05" },
+	{ "Bonn",			8,	"50o44 07o06" },
+	{ "Lauterbach",			4,	"50o38 09o24" },
+	{ "Lahn-Giessen",		3,	"50o35 08o40" },
+	{ "Fulda",			6,	"50o33 09o41" },
+	{ "Limburg",			2,	"50o23 08o04" },
+	{ "Koblenz",			9,	"50o22 07o36" },
+	{ "Mayen",			1,	"50o20 07o13" },
+	{ "Friedberg",			9,	"50o20 08o45" },
+	{ "Bad Brueckenau",		5,	"50o19 09o47" },
+	{ "Bad Neustadt",		8,	"50o19 10o13" },
+	{ "Hof / Saale",		4,	"50o19 11o55" },
+	{ "Bad Koenigshofen",		1,	"50o18 10o25" },
+	{ "Coburg",			2,	"50o16 10o58" },
+	{ "Pruem",			7,	"50o12 06o25" },
+	{ "St. Gorshausen",		4,	"50o09 07o43" },
+	{ "Hanau",			7,	"50o08 08o55" },
+	{ "Frankfurt",			6,	"50o07 08o41" },
+	{ "Wiesbaden",			5,	"50o05 08o14" },
+	{ "Bingen",			7,	"49o58 07o54" },
+	{ "Aschaffenburg",		8,	"49o58 09o09" },
+	{ "Bamberg",			5,	"49o54 10o54" },
+	{ "Darmstadt",			1,	"49o52 08o39" },
+	{ "Marktheidenfeld",		2,	"49o51 09o36" },
+	{ "Wuerzburg",			9,	"49o47 09o56" },
+	{ "Trier",			5,	"49o45 06o38" },
+	{ "Pegnitz",			1,	"49o45 11o34" },
+	{ "Idar-Oberstein",		8,	"49o43 07o19" },
+	{ "Mannheim",			3,	"49o29 08o28" },
+	{ "Kaiserslautern",		2,	"49o27 07o46" },
+	{ "Nuernberg",			9,	"49o27 11o05" },
+	{ "Heidelberg",			4,	"49o25 08o43" },
+	{ "Ansbach",			2,	"49o18 10o35" },
+	{ "Saarbruecken",		3,	"49o14 07o00" },
+	{ "Heilbronn",			7,	"49o09 09o13" },
+	{ "Schwaebisch Hall",		4,	"49o07 09o44" },
+	{ "Karlsruhe",			9,	"49o01 08o24" },
+	{ "Regensburg",			7,	"49o01 12o05" },
+	{ "Pforzheim",			6,	"48o54 08o43" },
+	{ "Deggendorf",			1,	"48o50 12o58" },
+	{ "Schwaebisch Gmuend",		1,	"48o48 09o48" },
+	{ "Stuttgart",			8,	"48o47 09o11" },
+	{ "Geislingen",			3,	"48o37 09o50" },
+	{ "Passau",			8,	"48o34 13o28" },
+	{ "Pfaffenhofen",		1,	"48o32 11o31" },
+	{ "Landshut",			3,	"48o32 12o09" },
+	{ "Offenburg",			4,	"48o28 07o56" },
+	{ "Pfarrkirchen",		6,	"48o25 12o55" },
+	{ "Ulm",			6,	"48o24 09o59" },
+	{ "Augsburg",			8,	"48o22 10o54" },
+	{ "Rottweil",			7,	"48o10 08o37" },
+	{ "Riedlingen",			1,	"48o09 09o28" },
+	{ "Muenchen",			4,	"48o08 11o34" },
+	{ "Wasserburg",			5,	"48o03 12o14" },
+	{ "Wittlich",			6,	"49o59 06o53" },
+	{ "Traben-Trarbach",		3,	"49o57 07o07" },
+	{ "Bayreuth",			6,	"49o57 11o35" },
+	{ "Volkach",			4,	"49o52 10o13" },
+	{ "Bad Kreuznach",		9,	"49o51 07o52" },
+	{ "Weiden",			8,	"49o40 12o09" },
+	{ "Wadern",			1,	"49o31 06o52" },
+	{ "Buchen",			1,	"49o31 09o19" },
+	{ "Bad Mergentheim",		5,	"49o30 09o46" },
+	{ "Amberg",			2,	"49o27 11o51" },
+	{ "Rothenburg",			6,	"49o23 10o11" },
+	{ "Roth",			3,	"49o15 11o05" },
+	{ "Pirmasens",			5,	"49o12 07o36" },
+	{ "Crailsheim",			8,	"49o08 10o04" },
+	{ "Hemau",			4,	"49o03 11o47" },
+	{ "Regen",			9,	"48o58 13o08" },
+	{ "Backnang",			9,	"48o57 09o26" },
+	{ "Baden-Baden",		1,	"48o46 08o14" },
+	{ "Wildbad",			2,	"48o45 08o33" },
+	{ "Donauwoerth",		5,	"48o42 10o48" },
+	{ "Heidenheim",			7,	"48o41 10o09" },
+	{ "Markt Schwaben",		9,	"48o11 11o52" },
+	{ "Mindelheim",			3,	"48o02 10o28" },
+	{ "Freiburg",			5,	"47o59 07o51" },
+	{ "Donaueschingen",		2,	"47o57 08o30" },
+	{ "Todtnau",			6,	"47o50 07o57" },
+	{ "Weilheim",			6,	"47o50 11o09" },
+	{ "Ravensburg",			4,	"47o47 09o37" },
+	{ "Bad Toelz",			7,	"47o46 11o33" },
+	{ "Kempten",			9,	"47o44 10o19" },
+	{ "Konstanz",			8,	"47o40 09o11" },
+	{ "Bad Reichenhall",		2,	"47o43 12o53" },
+	{ "Loerrach",			7,	"47o37 07o40" },
+	{ "Saeckingen",			1,	"47o33 07o57" },
+	{ "Garmisch-Partenkirchen",	2,	"47o30 11o05" },
+
+	/* Austria */
+	{ "Linz",			1,	"48o18 14o17" },
+	{ "Amstetten",			2,	"48o07 14o52" },
+	{ "St. Poelten",		3,	"08o12 15o37" },
+	{ "Wien-West",			1,	"48o11 16o21" },
+	{ "Wien-Ost",			2,	"48o13 16o23" },
+	{ "WR-Neustadt",		4,	"48o14 16o24" },
+	{ "Voecklamarkt",		4,	"48o00 13o29" },
+	{ "Gmunden",			3,	"47o55 13o48" },
+	{ "Schwaz",			8,	"47o21 11o42" },
+	{ "Salzburg",			3,	"47o48 13o02" },
+	{ "Innsbruck",			1,	"47o16 11o23" },
+	{ "Bruck",			3,	"47o25 15o16" },
+	{ "Graz",			5,	"47o04 15o26" },
+
+	/* Luxemburg */
+	{ "Neidhausen",			9,	"50o02 06o04" },
+	{ "Luxemburg",			9,	"49o37 06o08" },
+
+	{ NULL,				0,	NULL }
+};
+
+double lat_from_coordinates(const char *string)
+{
+	if (strlen(string) != 11)
+		abort();
+	if (string[0] < '0' && string[0] > '9')
+		abort();
+	if (string[1] < '0' && string[1] > '9')
+		abort();
+	if (string[2] != 'o')
+		abort();
+	if (string[3] < '0' && string[3] > '9')
+		abort();
+	if (string[4] < '0' && string[4] > '9')
+		abort();
+
+	return	(double)(string[0] - '0') * 10.0 +
+		(double)(string[1] - '0') +
+		(double)(string[3] - '0') / 6.0 +
+		(double)(string[4] - '0') / 60.0;
+}
+
+double lon_from_coordinates(const char *string)
+{
+	if (strlen(string) != 11)
+		abort();
+	if (string[6] < '0' && string[6] > '9')
+		abort();
+	if (string[7] < '0' && string[7] > '9')
+		abort();
+	if (string[8] != 'o')
+		abort();
+	if (string[9] < '0' && string[9] > '9')
+		abort();
+	if (string[10] < '0' && string[10] > '9')
+		abort();
+
+	return	(double)(string[6] - '0') * 10.0 +
+		(double)(string[7] - '0') +
+		(double)(string[9] - '0') / 6.0 +
+		(double)(string[10] - '0') / 60.0;
+}
+
+#define EQUATOR_RADIUS  6378137.0
+#define POLE_RADIUS     6356752.314
+
+#define PI              M_PI
+
+void station_list(void)
+{
+	int i;
+
+	printf("List of all base stations:\n");
+	for (i = 0; bnetz_stations[i].standort; i++) {
+		printf("%s (%.2f° N %.2f° E)\n", bnetz_stations[i].standort, lat_from_coordinates(bnetz_stations[i].coordinates), lon_from_coordinates(bnetz_stations[i].coordinates));
+	}
+}
+
+/* convert geo coordinates (lon/lat) to space coordinates in meters (x/y/z) */
+static void geo2space(double *x, double *y, double *z, double lat, double lon)
+{
+	*z = sin(lat / 180.0 * PI) * POLE_RADIUS;
+	*x = sin(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
+	*y = -cos(lon / 180.0 * PI) * cos(lat / 180.0 * PI) * EQUATOR_RADIUS;
+}
+
+/* calculate distance */
+static double distinspace(double x1, double y1, double z1, double x2, double y2, double z2)
+{
+	double x = x1 - x2;
+	double y = y1 - y2;
+	double z = z1 - z2;
+
+	return sqrt(x * x + y * y + z * z);
+}
+
+
+int get_station_by_coordinates(double lat, double lon)
+{
+	double dist, min = 0.0;
+	int i, min_i = 0;
+	double x, y, z;
+	double s_lat, s_lon;
+	double s_x, s_y, s_z;
+
+	geo2space(&x, &y, &z, lat, lon);
+
+	for (i = 0; bnetz_stations[i].standort; i++) {
+		s_lat = lat_from_coordinates(bnetz_stations[i].coordinates);
+		s_lon = lon_from_coordinates(bnetz_stations[i].coordinates);
+		geo2space(&s_x, &s_y, &s_z, s_lat, s_lon);
+		dist = distinspace(x, y, z, s_x, s_y, s_z);
+		if (i == 0 || dist < min) {
+			min = dist;
+			min_i = i;
+		}
+	}
+
+	/* don't allow distance more than 100KM */
+	if (min > 100000) {
+		fprintf(stderr, "Given coordinates are more than 100 km away from base station.\n");
+		return 0;
+	}
+	printf("Closest base station: %s (distance = %.2f km)\n", bnetz_stations[min_i].standort, min / 1000.0);
+	printf("  Gruppenfreisignal = %d\n", bnetz_stations[min_i].gfs);
+
+	return bnetz_stations[min_i].gfs;
+}
+
diff --git a/src/bnetz/stations.h b/src/bnetz/stations.h
new file mode 100644
index 0000000..ddfba91
--- /dev/null
+++ b/src/bnetz/stations.h
@@ -0,0 +1,4 @@
+
+void station_list(void);
+int get_station_by_coordinates(double lat, double lon);
+