Kroki/fg-navaid is a Perl script for querying navigation data cache that is kept by [FlightGear] (http://www.flightgear.org/). The cache is normally located at
~/.fgfs/navdata_X_Y.cache
where X and Y are major and minor version numbers. The script is
known to work with 2.12 and 2.99 (to become 3.0). I hadn't the chance
to test it with 2.10.
In it's basic form (and the only one supported for the moment) the
usage is kroki-fg-navaid LOCATION, where LOCATION is either a
comma-separated pair of coordinates (refer to kroki-fg-navaid --help
for syntax), or an object identifier:
$ kroki-fg-navaid OAK
--
Coordinates: N37°43'33.30", W122°13'24.90" (37.725917, -122.223583)
Magnetic declination: E13°55' (13.91)
Ident: OAK
Object: OAKLAND VORTAC
Elevation: 10'
Orientation: E17°00' (17.00)
Frequency: 116.8mhz (130nm)
$ kroki-fg-navaid KSFO
--
Coordinates: N37°37'15.04", W122°22'51.77" (37.620845, -122.381048)
Magnetic declination: E13°55' (13.91)
Ident: KSFO
Object: San Francisco Intl airport
Elevation: 13'
Runway 01R-19L: 8651' x 200', asphalt, ILS on 19L
Runway 01L-19R: 7502' x 200', asphalt
Runway 10R-28L: 10577' x 200', asphalt, ILS on 28L
Runway 10L-28R: 11843' x 200', asphalt, ILS on 28R
AWOS 1 (50nm): 118.05mhz
CLNC DEL (50nm): 118.2mhz
GND (50nm): 121.8mhz
NORCAL APP (50nm): 135.65mhz
NORCAL DEP (50nm): 135.1mhz
TWR (50nm): 120.5mhz
UNICOM (50nm): 122.95mhz
Detailed information about a particular runway can also be requested:
$ kroki-fg-navaid KSFO-28R
--
Coordinates: N37°36'48.71", W122°21'25.71" (37.613532, -122.357141)
Magnetic declination: E13°54' (13.90)
Ident: KSFO 28R
Object: San Francisco Intl airport, runway 28R
Surface: asphalt
Dimensions: 11843' x 200'
Elevation: 13'
Heading: 284°M (298°T)
ILS-cat-III (18nm): IGWQ 111.7mhz 284°M (298°T)
Glideslope: 3°
Middle marker: DME 2.5nm, RA 226', 0.5nm to runway edge
Inner marker: DME 2.1nm, RA 101', 0.1nm to runway edge
Runway edge: DME 2.0nm, RA 57'
Touchdown: 0.1nm past runway edge
Output in metric system is enabled by --metric or -m:
$ kroki-fg-navaid -m RJCC-01L
--
Coordinates: N42°45'41.90", E141°41'34.17" (42.761640, 141.692826)
Magnetic declination: W8°50' (-8.84)
Ident: RJCC 01L
Object: NEW CHITOSE airport, runway 01L
Surface: asphalt
Dimensions: 3001m x 60m
Elevation: 24m
Heading: 001°M (353°T)
ILS-cat-I (33km): ICN 110.9mhz 001°M (353°T)
Glideslope: 3°
Middle marker: DME 0.9km, RA 66m, 0.9km to runway edge
Runway edge: DME 0.0km, RA 15m
Touchdown: 0.3km past runway edge
Bearings from the location to nearest beacons are reported with
--bearings or -b, for instance:
$ kroki-fg-navaid --bearings=3 IBURI
--
Coordinates: N41°55'59.24", E141°28'10.71" (41.9331220, 141.4696410)
Magnetic declination: W8°37' (-8.62)
Ident: IBURI
Object: fix
Airways: V11 (low, high)
Bearing from HAKODATE VOR-DME (HWE 112.3mhz 100nm): 080°R (071°T) 30.1nm
Bearing to HAKODATE NDB (HW 388khz 25nm): 261°M (252°T) 30.6nm
Bearing from MUKAWA VOR-DME (MKE 116.4mhz 25nm): 219°R (210°T) 43.1nm
For aircrafts having NVU (think of [tu154b]
(https://github.com/yuriknsk/tu154b)) there's an option --rsbns (or
-R):
$ kroki-fg-navaid -m -R UIIB-15
--
Coordinates: N52°55'47.34", E103°33'28.95" (52.9298168, 103.5580417)
Magnetic declination: W3°57' (-3.95)
Ident: UIIB 15
Object: Belaya airport, runway 15
Surface: concrete
Dimensions: 3999m x 79m
Elevation: 456m
Heading: 148°M (144°T)
NVU heading: ZPU:148°15'M UK:144°18'T
BELAYA RSBN Ch06 VORTAC (GW 960.25mhz 240km): Sm:+1.98km Zm:-0.25km (2.0km)
All distances and heights are rounded downwards.
Note that the output is only as accurate and complete as the cache contents, which itself is derived from text navdata files that are known to be flawed in many locations. Use your good judgment when relying on the output.
Kroki/fg-navaid will work with Perl 5.12 and above, and requires the following modules to be installed:
DBI
DBD::SQLite
Geo::Inverse
Regexp::Grammars
DateTime