This code, if added using the Code Snippets plugin, will add an extra column with the URL or permalink for each listing when you export your listings:

/**
 * Export listing url in CSV file.
 */
function gd_snippet_200814_export_posts_csv_row( $post_info, $post_ID, $post_type ) {
	$post_info['post_url'] = get_permalink( $post_ID );

	return $post_info;
}
add_filter( 'geodir_export_posts_csv_row', 'gd_snippet_200814_export_posts_csv_row', 20, 3 );

function gd_snippet_200814_export_posts_csv_columns( $columns, $post_type ) {
	$columns[] = 'post_url';

	return $columns;
}
add_filter( 'geodir_export_posts_csv_columns', 'gd_snippet_200814_export_posts_csv_columns', 20, 2 );