getMagneticDeclination
open override fun getMagneticDeclination(latitude: Float, longitude: Float, altitude: Float = 0.0f, timeMillis: Long): Float?
Calculate magnetic declination at the given location and time.
Return
Magnetic declination in degrees (-180 to +180), or null if calculation fails (e.g., location outside modeled region, time too far in past/future)
Parameters
latitude
Latitude in degrees (-90 to +90)
longitude
Longitude in degrees (-180 to +180)
altitude
Altitude in meters above sea level (optional, defaults to 0)
timeMillis
Timestamp in milliseconds since Unix epoch (UTC)