(VikDataSourceProgressFunc) datasource_gps_progress,
(VikDataSourceAddProgressWidgetsFunc) datasource_gps_add_progress_widgets,
(VikDataSourceCleanupFunc) datasource_gps_cleanup,
(VikDataSourceProgressFunc) datasource_gps_progress,
(VikDataSourceAddProgressWidgetsFunc) datasource_gps_add_progress_widgets,
(VikDataSourceCleanupFunc) datasource_gps_cleanup,