(VikDataSourceInitFunc) datasource_gps_init_func,
(VikDataSourceCheckExistenceFunc) NULL,
(VikDataSourceAddSetupWidgetsFunc) datasource_gps_add_setup_widgets,
(VikDataSourceInitFunc) datasource_gps_init_func,
(VikDataSourceCheckExistenceFunc) NULL,
(VikDataSourceAddSetupWidgetsFunc) datasource_gps_add_setup_widgets,