diff --git a/main.c b/main.c
index 4bd8be1..68b3505 100644
--- a/main.c
+++ b/main.c
@@ -2686,6 +2686,7 @@ int main(void)
   set_mode(M_LOW);
   sweep(true);
 
+  setting.refer = -1;
   ui_mode_menu();       // Show menu when autostarting mode
 
 
diff --git a/nanovna.h b/nanovna.h
index eb496af..e3c5a57 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -351,7 +351,7 @@ enum trace_type {
 
 #define MAX_UNIT_TYPE 4
 enum unit_type {
-  U_DBM=0, U_DBMV, U_DBUV, U_VOLT, U_WATT
+  U_DBM=0, U_DBMV, U_DBUV, U_VOLT, U_WATT, U_DBC //  dBc only for displaying delta marker info
 };
 #define UNIT_IS_LINEAR(T) ( T >= U_VOLT ? true : false)
 #define UNIT_IS_LOG(T) ( T >= U_VOLT ? false : true)
diff --git a/plot.c b/plot.c
index 1a04554..4b80199 100644
--- a/plot.c
+++ b/plot.c
@@ -843,6 +843,7 @@ static void trace_get_value_string(
   uint32_t dfreq = 0;
   float rlevel = 0;
   int ii = i;
+  int unit_index = setting.unit;
   if (mtype & M_DELTA) {
     if (ri > i) {
       dfreq = frequencies[ri] - frequencies[i];
@@ -854,11 +855,15 @@ static void trace_get_value_string(
       buf2[0] = '+';
     }
     rlevel = value(coeff[ri]);
+    unit_index = U_DBC;
   } else {
     dfreq = frequencies[i];
   }
   if (FREQ_IS_CW()) {
     float t = ii*(setting.actual_sweep_time)*1000.0/290.0;
+#if 1
+    plot_printf(&buf2[1], sizeof(buf2) -1, "%.3FS" , t/1000000.0);
+#else
     if (t>1000000.0){
       plot_printf(&buf2[1], sizeof(buf2) -1, "%4f" , t/1000000.0);
       buf2[5] = 'S';
@@ -876,6 +881,7 @@ static void trace_get_value_string(
         buf2[6] = 'S';
         buf2[7]=0;
     }
+#endif
   } else {
   uint32_t resolution = get_sweep_frequency(ST_SPAN)/290;
   if (resolution  <= 2000)
@@ -898,7 +904,7 @@ static void trace_get_value_string(
       } else {
         plot_printf(buf3, sizeof(buf3), "%.1f", v);
       }
-      plot_printf(buf, len, "%s %s%s%s", buf2, buf3, unit_string[setting.unit],(mtype & M_NOISE?"/Hz":""));
+      plot_printf(buf, len, "%s %s%s%s", buf2, buf3, unit_string[unit_index],(mtype & M_NOISE?"/Hz":""));
     }
 }
 
@@ -1580,13 +1586,13 @@ draw_all_cells(bool flush_markmap)
     clear_markmap();
   }
 #ifdef __SCROLL__
-  int w = area_width - 5;
+  int w = area_width;
   if (w < 5) w = 5;
   if (waterfall) {
     for (m = 226; m >= HEIGHT+3; m -= 1) {		// Scroll down
       uint16_t *buf = &spi_buffer[0];
-      ili9341_read_memory(5*5, m, w, 1, w, buf);
-      ili9341_bulk(5*5,m+1, w,1);
+      ili9341_read_memory(6*5, m, w, 1, w, buf);
+      ili9341_bulk(6*5,m+1, w,1);
     }
     for (int i=0; i<290; i++) {			// Add new topline
 #if 0
@@ -1678,7 +1684,7 @@ draw_all_cells(bool flush_markmap)
 #endif
       spi_buffer[i] = RGB565(r,g,b);
     }
-    ili9341_bulk(5*5,HEIGHT+3, w,1);
+    ili9341_bulk(6*5,HEIGHT+3, w,1);
   }
 #endif
 }
diff --git a/sa_core.c b/sa_core.c
index 20f0342..dc6f861 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -58,7 +58,7 @@ void reset_settings(int m)
   setting.linearity_step = 0;
   trace[TRACE_STORED].enabled = false;
   trace[TRACE_TEMP].enabled = false;
-  setting.refer = -1;
+//  setting.refer = -1;             // do not reset reffer when switching modes
   setting.mute = true;
 #ifdef __SPUR__
   setting.spur = 0;
@@ -1816,7 +1816,7 @@ float my_round(float v)
   return v;
 }
 
-const char * const unit_string[] = { "dBm", "dBmV", "dBuV", "V", "W" };
+const char * const unit_string[] = { "dBm", "dBmV", "dBuV", "V", "W", "dBc" };
 
 static const float scale_value[]={50000, 20000, 10000, 5000, 2000, 1000, 500, 200, 100, 50, 20,10,5,2,1,0.5,0.2,0.1,0.05,0.02,0.01,0.005,0.002, 0.001,0.0005,0.0002, 0.0001};
 static const char * const scale_vtext[]= {"50000", "20000", "10000", "5000", "2000", "1000", "500", "200", "100", "50", "20","10","5","2","1","0.5","0.2","0.1","0.05","0.02","0.01", "0.005","0.002","0.001", "0.0005","0.0002","0.0001"};
diff --git a/ui_sa.c b/ui_sa.c
index 967138a..fbbe6e9 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -1373,12 +1373,12 @@ static const menuitem_t menu_scanning_speed[] =
 
 static const menuitem_t menu_settings2[] =
 {
-  { MT_CALLBACK, 1,     "AGC",                  menu_settings2_cb},
-  { MT_CALLBACK, 2,     "LNA",                  menu_settings2_cb},
-  { MT_CALLBACK | MT_LOW, 3,     "BPF",                  menu_settings2_cb},
-  { MT_CALLBACK | MT_LOW, 4,     "\2BELOW\0IF",          menu_settings2_cb},
-  { MT_KEYPAD,   KM_DECAY,"\2HOLD\0TIME",         "1..1000"},
-  { MT_KEYPAD,   KM_NOISE,"\2NOISE\0LEVEL",       "2..20"},
+  { MT_CALLBACK, 1,             "AGC",              menu_settings2_cb},
+  { MT_CALLBACK, 2,             "LNA",              menu_settings2_cb},
+  { MT_CALLBACK | MT_LOW, 3,    "BPF",              menu_settings2_cb},
+  { MT_CALLBACK | MT_LOW, 4,    "\2BELOW\0IF",      menu_settings2_cb},
+  { MT_KEYPAD,   KM_DECAY,      "\2HOLD\0SWEEPS",   "1..1000"},
+  { MT_KEYPAD,   KM_NOISE,      "\2NOISE\0LEVEL",   "2..20"},
 #ifdef __ULTRA__
   { MT_SUBMENU,0,               "HARMONIC",         menu_harmonic},
 #endif