ardupilot/libraries/AP_Declination/AP_Declination.h

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#pragma once
/*
magnetic data derived from WMM
*/
class AP_Declination
{
public:
/*
* Calculates the magnetic intensity, declination and inclination at a given WGS-84 latitude and longitude.
* Assumes a WGS-84 height of zero
* latitude and longitude have units of degrees
* declination and inclination are returned in degrees
* intensity is returned in Gauss
* Boolean returns false if latitude and longitude are outside the valid input range of +-60 latitude and +-180 longitude
*/
static bool get_mag_field_ef(float latitude_deg, float longitude_deg, float &intensity_gauss, float &declination_deg, float &inclination_deg);
/*
get declination in degrees for a given latitude_deg and longitude_deg
*/
static float get_declination(float latitude_deg, float longitude_deg);
private:
static const float declination_table[13][37];
static const float inclination_table[13][37];
static const float intensity_table[13][37];
};