lat1 | yes | | decimal degrees or degrees minutes seconds: -90.0 to 90.0 |

lon1 | yes | | decimal degrees or degrees minutes seconds: -180.0 to 180.0 |

elevation | | 0.0 | elevation of calculation location: -10 - 600 km |

elevationUnits | | K | units of elevation parameter: 'K', 'M', or 'F' |

model | | IGRF | which magnetic reference model to use: 'WMM' or 'IGRF' |

startYear | | current year | start year of calculation interval: 1900 - 2014 for IGRF model, 2010-2014 for WMM model |

startMonth | | current month | start month of calculation interval: 1 - 12 |

startDay | | current day | start day of calculation interval: 1 - 31 |

endYear | | current year | end year of calculation interval: 1900 - 2014 for IGRF model, 2010-2014 for WMM model |

endMonth | | current month | end month of calculation interval: 1 - 12 |

endDay | | current day | end day of calculation interval: 1 - 31 |

dateStepSize | | 1.0 | size of steps through calculation interval in decimal years |

resultFormat | | html | format of calculation results: 'html', 'csv', or 'xml' |