diff --git a/code/hud/hud.cpp b/code/hud/hud.cpp
index b205a2fe817..59862334db9 100644
--- a/code/hud/hud.cpp
+++ b/code/hud/hud.cpp
@@ -885,7 +885,7 @@ void HudGauge::renderPrintfWithGauge(int x, int y, int gauge_id, float scale, bo
 	renderString(x, y, gauge_id, tmp, scale, config);
 }
 
-void HudGauge::renderBitmapColor(int frame, int x, int y, float scale, bool config)
+void HudGauge::renderBitmapColor(int frame, int x, int y, float scale, bool config) const
 {
 	int nx = 0, ny = 0;
 
@@ -921,7 +921,7 @@ void HudGauge::renderBitmapColor(int frame, int x, int y, float scale, bool conf
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderBitmap(int x, int y, float scale, bool config)
+void HudGauge::renderBitmap(int x, int y, float scale, bool config) const
 {
 	int nx = 0, ny = 0;
 
@@ -957,14 +957,14 @@ void HudGauge::renderBitmap(int x, int y, float scale, bool config)
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderBitmap(int frame, int x, int y, float scale, bool config)
+void HudGauge::renderBitmap(int frame, int x, int y, float scale, bool config) const
 {
 	gr_set_bitmap(frame);
 	renderBitmap(x, y, scale, config);
 }
 
 // Note that w, h, sx, and sy whould be unscaled values!
-void HudGauge::renderBitmapEx(int frame, int x, int y, int w, int h, int sx, int sy, float scale, bool config)
+void HudGauge::renderBitmapEx(int frame, int x, int y, int w, int h, int sx, int sy, float scale, bool config) const
 {
 	int nx = 0, ny = 0; 
 	
@@ -1002,7 +1002,7 @@ void HudGauge::renderBitmapEx(int frame, int x, int y, int w, int h, int sx, int
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderLine(int x1, int y1, int x2, int y2, bool config)
+void HudGauge::renderLine(int x1, int y1, int x2, int y2, bool config) const
 {
 	int nx = 0, ny = 0;
 
@@ -1031,7 +1031,7 @@ void HudGauge::renderLine(int x1, int y1, int x2, int y2, bool config)
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderGradientLine(int x1, int y1, int x2, int y2, bool config)
+void HudGauge::renderGradientLine(int x1, int y1, int x2, int y2, bool config) const
 {
 	int nx = 0, ny = 0;
 
@@ -1060,7 +1060,7 @@ void HudGauge::renderGradientLine(int x1, int y1, int x2, int y2, bool config)
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderRect(int x, int y, int w, int h, bool config)
+ void HudGauge::renderRect(int x, int y, int w, int h, bool config) const
 {
 	int nx = 0, ny = 0;
 
@@ -1089,7 +1089,7 @@ void HudGauge::renderRect(int x, int y, int w, int h, bool config)
 	gr_reset_screen_scale();
 }
 
-void HudGauge::renderCircle(int x, int y, int diameter, bool filled, bool config) 
+void HudGauge::renderCircle(int x, int y, int diameter, bool filled, bool config) const
 {
 	int nx = 0, ny = 0;
 
diff --git a/code/hud/hud.h b/code/hud/hud.h
index 19f58e9ca61..81213683e20 100644
--- a/code/hud/hud.h
+++ b/code/hud/hud.h
@@ -342,20 +342,19 @@ class HudGauge
 	void setGaugeFrame(int frame_offset);
 
 	// rendering functions
-	void renderBitmap(int x, int y, float scale = 1.0f, bool config = false);
-	void renderBitmap(int frame, int x, int y, float scale = 1.0f, bool config = false);
-	void renderBitmapColor(int frame, int x, int y, float scale = 1.0f, bool config = false);
-	void renderBitmapUv(int frame, int x, int y, int w, int h, float u0, float v0, float u1, float v1);
-	void renderBitmapEx(int frame, int x, int y, int w, int h, int sx, int sy, float scale = 1.0f, bool config = false);
+	void renderBitmap(int x, int y, float scale = 1.0f, bool config = false) const;
+	void renderBitmap(int frame, int x, int y, float scale = 1.0f, bool config = false) const;
+	void renderBitmapColor(int frame, int x, int y, float scale = 1.0f, bool config = false) const;
+	void renderBitmapEx(int frame, int x, int y, int w, int h, int sx, int sy, float scale = 1.0f, bool config = false) const;
 	void renderString(int x, int y, const char *str, float scale = 1.0f, bool config = false);
 	void renderString(int x, int y, int gauge_id, const char *str, float scale = 1.0f, bool config = false);
 	void renderStringAlignCenter(int x, int y, int area_width, const char *s, float scale = 1.0f, bool config = false);
-	void renderPrintf(int x, int y, float scale, bool config, SCP_FORMAT_STRING const char* format, ...) SCP_FORMAT_STRING_ARGS(4, 5);
-	void renderPrintfWithGauge(int x, int y, int gauge_id, float scale, bool config, SCP_FORMAT_STRING const char* format, ...)  SCP_FORMAT_STRING_ARGS(5, 6);
-	void renderLine(int x1, int y1, int x2, int y2, bool config = false);
-	void renderGradientLine(int x1, int y1, int x2, int y2, bool config = false);
-	void renderRect(int x, int y, int w, int h, bool config = false);
-	void renderCircle(int x, int y, int diameter, bool filled = true, bool config = false);
+	void renderPrintf(int x, int y, float scale, bool config, SCP_FORMAT_STRING const char* format, ...) SCP_FORMAT_STRING_ARGS(6, 7);
+	void renderPrintfWithGauge(int x, int y, int gauge_id, float scale, bool config, SCP_FORMAT_STRING const char* format, ...)  SCP_FORMAT_STRING_ARGS(7, 8);
+	void renderLine(int x1, int y1, int x2, int y2, bool config = false) const;
+	void renderGradientLine(int x1, int y1, int x2, int y2, bool config = false) const;
+	void renderRect(int x, int y, int w, int h, bool config = false) const;
+	void renderCircle(int x, int y, int diameter, bool filled = true, bool config = false) const;
 
 	void unsize(int *x, int *y);
 	void unsize(float *x, float *y);
diff --git a/code/hud/hudtargetbox.cpp b/code/hud/hudtargetbox.cpp
index adc08733540..6971ffa1f94 100644
--- a/code/hud/hudtargetbox.cpp
+++ b/code/hud/hudtargetbox.cpp
@@ -1341,7 +1341,7 @@ void HudGaugeTargetBox::renderTargetJumpNode(object *target_objp)
 		hud_num_make_mono(outstr, font_num);
 		gr_get_string_size(&w,&h,outstr);
 	
-		renderPrintf(position[0] + Dist_offsets[0]+hx, position[1] + Dist_offsets[1]+hy, EG_TBOX_DIST, "%s", outstr);
+		renderPrintfWithGauge(position[0] + Dist_offsets[0]+hx, position[1] + Dist_offsets[1]+hy, EG_TBOX_DIST, 1.0f, false, "%s", outstr);
 	}
 }
 
@@ -1713,7 +1713,7 @@ void HudGaugeTargetBox::renderTargetShipInfo(object *target_objp)
 		maybeFlashElement(TBOX_FLASH_HULL);
 	}
 
-	renderPrintf(position[0] + Hull_offsets[0]-w, position[1] + Hull_offsets[1], EG_TBOX_HULL, "%s", outstr);	
+	renderPrintfWithGauge(position[0] + Hull_offsets[0]-w, position[1] + Hull_offsets[1], EG_TBOX_HULL, 1.0f, false, "%s", outstr);	
 	setGaugeColor();
 
 	// print out the targeted sub-system and % integrity
diff --git a/code/mission/missiontraining.cpp b/code/mission/missiontraining.cpp
index 3f9a9ce5ea2..5bda669bed0 100644
--- a/code/mission/missiontraining.cpp
+++ b/code/mission/missiontraining.cpp
@@ -262,7 +262,7 @@ void HudGaugeDirectives::render(float  /*frametime*/, bool /*config*/)
 		renderBitmap(directives_top.first_frame, position[0], position[1]);
 
 	// print out title
-	renderPrintf(position[0] + header_offsets[0], position[1] + header_offsets[1], EG_OBJ_TITLE, "%s", XSTR( "directives", 422));
+	renderPrintfWithGauge(position[0] + header_offsets[0], position[1] + header_offsets[1], EG_OBJ_TITLE, 1.0f, false, "%s", XSTR( "directives", 422));
 
 	bx = position[0];
 	by = position[1] + middle_frame_offset_y;
diff --git a/code/radar/radardradis.h b/code/radar/radardradis.h
index 9480219b542..8924366955c 100644
--- a/code/radar/radardradis.h
+++ b/code/radar/radardradis.h
@@ -11,6 +11,7 @@
 
 #include "globalincs/pstypes.h"
 #include "radar/radarsetup.h"
+#include "gamesnd/gamesnd.h"
 
 class object;
 struct blip;