Geodesy & Navigation
Latitude & Longitude
locate a point on Earth using latitude-longitude coordinates
55 deg 45' N, 37 deg 37' E
find the coordinates of a city
Algiers coordinates
Distances
compute the great-circle distance between points on the globe
23.5S 46.4W to 56.8N 60.6E
compute the distance between cities
San Francisco to Tokyo
compute distances between multiple cities
Buenos Aires to Sao Paulo to La Paz to Panama
compute the distance to the horizon
how far can I see at 30,000 ft
calculate line of sight to the horizon from Mount Everest
compute horzon distance for radio waves
how far can radio waves propagate
calculate radio horizon at 100 m altitude
Bearings
get information about a compass heading
SSW
15 North
Geodetic Data
get information about a geodetic reference ellipsoid
GRS80
compare multiple ellipsoids
Airy 1830, Modified Fischer 1960
get information about a geodetic datum
GDA94
compare multiple geodetic data
NAD27, ITRF00
compute current local gravitational field strength
geogravity
compute gravitational field strength at specified coordinates
geogravity 21.28N 157.60W
compute current local geomagnetic field strength
geomagnetism
compute geomagnetic field strength for a given date and location