/magnetic_field

Calculate magnetic declination, inclination, total field intensity, and grid variation

• altitude (query, required) — Geodetic Altitude 0 km to 600 km.
• latitude (query, required) — Geodetic Latitude. -90 deg (S) to 90 deg (N).
• longitude (query, required) — Geodetic Longitude. -180 deg (W) to 180 deg (E).
• year (query, required) — Year as a decimal in the range 2015-2025 (2017.5 would be half way through 2017).