diff --git a/DlgMarker.cpp b/DlgMarker.cpp
index b776a45..b9a8b42 100644
--- a/DlgMarker.cpp
+++ b/DlgMarker.cpp
@@ -16,6 +16,11 @@ CDlgMarker::CDlgMarker(CWnd* pParent /*=NULL*/)
 	EnableVisualManagerStyle(TRUE, TRUE);
 
 	m_iSelectedIndex = -1;
+
+	for (int i=0;i<g_iMarkerPtNum;++i)
+	{
+		g_lMarkerLayerID[i] = -1;
+	}
 }
 
 CDlgMarker::~CDlgMarker()
diff --git a/GISDlg.cpp b/GISDlg.cpp
index e11b9c2..59f11e2 100644
--- a/GISDlg.cpp
+++ b/GISDlg.cpp
@@ -13,6 +13,7 @@
 #include "SetSaveLineID.h"
 #include "CUtils.h"
 
+
 //#include "8BMapDLL_type.h"
 
 #include <fstream>
@@ -2593,7 +2594,7 @@ void CGISDlg::MouseDownMap1(short Button, short Shift, long x, long y)
 						m_CircleGuideLayer = m_map.NewDrawing(1);
 					}
 
-					double radius = circleGuidenceDlg.g_radius/abs(2*M_PI*6371000*cos(m_guidePtInfo.guidePtLat*M_PI/180)/360);
+					double radius = circleGuidenceDlg.g_radius/abs(2*M_PI*6378137*cos(m_guidePtInfo.guidePtLat*M_PI/180)/360);
 
 					m_map.DrawWideCircleEx(m_CircleGuideLayer,m_guidePtInfo.guidePtLon,m_guidePtInfo.guidePtLat,radius,RGB(248,252,55),false,2);
 					m_map.Redraw();