globalmapper.GetAvailableOnlineSourceList
=========================================

.. currentmodule:: globalmapper
.. py:function:: GetAvailableOnlineSourceList () -> GM_OnlineSourceInfo_t, uint32

    Returns a pointer to the start of an array of GM_OnlineSourceInfo_t structures, as well as the array's length,
    which represents all the available online sources.

    :returns: The start of the array of online sources that are available
    :rtype: GM_OnlineSourceInfo_t
    :return: Number of sources in the array
    :rtype: uint32