diff --git a/game/reconstructed/btl4app.cpp b/game/reconstructed/btl4app.cpp
index 0a2439d..4cf3cf9 100644
--- a/game/reconstructed/btl4app.cpp
+++ b/game/reconstructed/btl4app.cpp
@@ -645,6 +645,9 @@ BTL4Application::SharedData
 		BTL4GaugeRenderer
 			*gauge_renderer = (BTL4GaugeRenderer*)GetGaugeRenderer();	// *(this+0x4c)
 
+		if (getenv("BT_VSS_LOG"))
+			DEBUG_STREAM << "[vss] MakeViewpointEntity: gaugeRenderer="
+						<< (int)(gauge_renderer != NULL) << " -> ConfigureForModel(Init)\n" << std::flush;
 		if (gauge_renderer != NULL)
 		{
 			gauge_renderer->ConfigureForModel("Init", viewing_entity);	// FUN_0046ff64
diff --git a/game/reconstructed/btl4gau2.cpp b/game/reconstructed/btl4gau2.cpp
index b494898..79f230b 100644
--- a/game/reconstructed/btl4gau2.cpp
+++ b/game/reconstructed/btl4gau2.cpp
@@ -1371,6 +1371,8 @@ Logical
 		imageNames[p] = methodDescription.parameterList[p].data.string;
 
 	int count = entity->GetSubsystemCount();				// entity+0x124
+	if (getenv("BT_VSS_LOG"))
+		DEBUG_STREAM << "[vss] Make called: subsystemCount=" << count << "\n" << std::flush;
 	for (int i = 0; i < count; i++)
 	{
 		if (i == 0)											// slot 0 = the controls mapper
@@ -1382,6 +1384,9 @@ Logical
 			continue;
 
 		int group = *(int *)((char *)sub + 0x1dc) - 1;		// aux-screen position 1..12
+		if (getenv("BT_VSS_LOG"))
+			DEBUG_STREAM << "[vss] i=" << i << " classID=" << (int)sub->GetClassID()
+						<< " auxScreen[0x1dc]=" << (group + 1) << "\n" << std::flush;
 		if (group < 0)
 		{
 			DebugStream << "Auxiliary screen position = zero\n";