diff --git a/library/include/df/custom/coord2d_path.methods.inc b/library/include/df/custom/coord2d_path.methods.inc
new file mode 100644
index 000000000..c36c5c0fa
--- /dev/null
+++ b/library/include/df/custom/coord2d_path.methods.inc
@@ -0,0 +1,20 @@
+unsigned size() const { return x.size(); }
+
+coord2d operator[] (unsigned idx) const {
+    if (idx >= x.size())
+        return coord2d();
+    else
+        return coord2d(x[idx], y[idx]);
+}
+
+void erase(unsigned idx) {
+    if (idx < x.size()) {
+        x.erase(x.begin()+idx);
+        y.erase(y.begin()+idx);
+    }
+}
+
+void push_back(const coord2d &crd) {
+    x.push_back(crd.x);
+    y.push_back(crd.y);
+}
diff --git a/library/include/df/custom/coord_path.methods.inc b/library/include/df/custom/coord_path.methods.inc
index d3c48de7f..9acebb82a 100644
--- a/library/include/df/custom/coord_path.methods.inc
+++ b/library/include/df/custom/coord_path.methods.inc
@@ -1,8 +1,22 @@
 unsigned size() const { return x.size(); }
 
 coord operator[] (unsigned idx) const {
-    if (idx >= x.size() || idx >= y.size() || idx >= z.size())
+    if (idx >= x.size())
         return coord();
     else
         return coord(x[idx], y[idx], z[idx]);
 }
+
+void erase(unsigned idx) {
+    if (idx < x.size()) {
+        x.erase(x.begin()+idx);
+        y.erase(y.begin()+idx);
+        z.erase(z.begin()+idx);
+    }
+}
+
+void push_back(const coord &crd) {
+    x.push_back(crd.x);
+    y.push_back(crd.y);
+    z.push_back(crd.z);
+}
diff --git a/library/include/df/custom/inorganic_raw.methods.inc b/library/include/df/custom/inorganic_raw.methods.inc
new file mode 100644
index 000000000..e69de29bb
diff --git a/library/include/df/custom/material.methods.inc b/library/include/df/custom/material.methods.inc
new file mode 100644
index 000000000..e69de29bb
diff --git a/library/modules/Maps.cpp b/library/modules/Maps.cpp
index ec70c8d0a..1b4661004 100644
--- a/library/modules/Maps.cpp
+++ b/library/modules/Maps.cpp
@@ -567,7 +567,7 @@ bool Maps::ReadGeology (vector < vector <uint16_t> >& assign)
         if (bioRY >= world->world_data->world_height) bioRY = world->world_data->world_height - 1;
 
         // get index into geoblock vector
-        uint16_t geoindex = world->world_data->unk_1c0[bioRX][bioRY].geo_index;
+        uint16_t geoindex = world->world_data->region_map[bioRX][bioRY].geo_index;
 
         /// geology blocks have a vector of layer descriptors
         // get the vector with pointer to layers
diff --git a/library/xml b/library/xml
index 8f9f7cf3b..f6d09c951 160000
--- a/library/xml
+++ b/library/xml
@@ -1 +1 @@
-Subproject commit 8f9f7cf3bc4cff3dc721dc9e0ba51bc54b069587
+Subproject commit f6d09c95153150d7d1f00592336012af5e6e02ad