use measurement_base for distance calculation

application/views/view_log/qso.php

@@ -75,7 +75,7 @@
 							$CI->load->library('qra');
 
 							// Cacluate Distance
-							echo $CI->qra->distance($row->station_gridsquare, $row->COL_GRIDSQUARE, 'M');
+							echo $CI->qra->distance($row->station_gridsquare, $row->COL_GRIDSQUARE, $this->config->item('measurement_base'));
 							switch ($this->config->item('measurement_base')) {
 							    case 'M':
 							        echo "mi";