diff --git a/core/models/survex.py b/core/models/survex.py
index 37e8eb5..7c0f38e 100644
--- a/core/models/survex.py
+++ b/core/models/survex.py
@@ -86,22 +86,23 @@ class SurvexStationLookUpManager(models.Manager):
 
 class SurvexStation(models.Model):
     name = models.CharField(max_length=100)
-    block = models.ForeignKey("SurvexBlock", null=True, on_delete=models.SET_NULL)
+    # block = models.ForeignKey("SurvexBlock", null=True, on_delete=models.SET_NULL)
+    # block not used since 2020. survex stations objects are only used for entrnce locations and all taken from the .3d file
     objects = SurvexStationLookUpManager() # overwrites SurvexStation.objects and enables lookup() 
     x = models.FloatField(blank=True, null=True)
     y = models.FloatField(blank=True, null=True)
     z = models.FloatField(blank=True, null=True)
 
-    def path(self):
-        r = self.name
-        b = self.block
-        while True:
-            if b.name:
-                r = b.name + "." + r
-            if b.parent:
-                b = b.parent
-            else:
-                return r
+    # def path(self):
+        # r = self.name
+        # b = self.block
+        # while True:
+            # if b.name:
+                # r = b.name + "." + r
+            # if b.parent:
+                # b = b.parent
+            # else:
+                # return r
 
     class Meta:
         ordering = ("id",)
diff --git a/parsers/locations.py b/parsers/locations.py
index 8384028..b3a318c 100644
--- a/parsers/locations.py
+++ b/parsers/locations.py
@@ -192,30 +192,42 @@ def LoadPositions():
 
     posfile = open(pospath)
     posfile.readline()  # Drop header
-    try:
-        survexblockroot = SurvexBlock.objects.get(name=ROOTBLOCK)
-    except:
-        try:
-            survexblockroot = SurvexBlock.objects.get(id=1)
-        except:
-            message = " ! FAILED to find root SurvexBlock"
-            print(message)
-            stash_data_issue(parser="entrances", message=message)
-            raise
+    
+    # not used survexblock on a SurvexStation since we stopped storing all of them in 2020:
+    # try:
+        # survexblockroot = SurvexBlock.objects.get(name=ROOTBLOCK)
+    # except:
+        # try:
+            # survexblockroot = SurvexBlock.objects.get(id=1)
+        # except:
+            # message = " ! FAILED to find root SurvexBlock"
+            # print(message)
+            # stash_data_issue(parser="entrances", message=message)
+            # raise
+    sbdict = {}
+    dups = 0
+    lineno = 1 # we dropped the header
     for line in posfile.readlines():
+        lineno += 1
         r = poslineregex.match(line)
         if r:
-            x, y, z, id = r.groups()
+            x, y, z, sbid = r.groups() # renamed id to sbid so as to not confuse with Django internal .id
+            if sbid in sbdict:
+                dups += 1
+                message = f" ! DUPLICATE SurvexBlock identifier in .pos file '{sbid}'\n{sbs[sbid]}\n{lineno} / {line}"
+                print(message)
+                stash_data_issue(parser="entrances", message=message)
+            else:
+                sbdict[sbid] = lineno
+ 
             for sid in mappoints:
-                if id.endswith(sid):
-                    blockpath = "." + id[: -len(sid)].strip(".")
-                    # But why are we doing this? Why do we need the survexblock id for each of these ?
+                if sbid.endswith(sid):
+                    blockpath = "." + sbid[: -len(sid)].strip(".") # only the most recent one that is mappoints
+                    # But why are we doing this? Why do we want the survexblock id for each of these ?
                     # ..because mostly they don't actually appear in any SVX file. We should match them up
                     # via the cave data, not by this half-arsed syntactic match which almost never works. PMS.
                     
-                    # It is pointless linking them all to the root survexblock, they don't need it.
-                    # If there is a link to a survexblock it should be the one the station appears in !
-                    # But we are reading the .pos file so we only know the SurvexFile not the SurvexBlock..
+                    # We are reading the .pos file so we only know the SurvexFile not the SurvexBlock.
                     # ghastly.
                     if False:
                         try:
@@ -223,29 +235,28 @@ def LoadPositions():
                             if len(sbqs) == 1:
                                 sbqs[0]
                             if len(sbqs) > 1:
-                                message = f" ! MULTIPLE SurvexBlocks {len(sbqs):3} matching Entrance point {blockpath} {sid} '{id}'"
+                                message = f" ! MULTIPLE {len(sbqs):3} SurvexBlocks '{blockpath}' from survex files mention Entrance point  '{sbid}' (line {lineno})"
                                 print(message)
                                 stash_data_issue(parser="entrances", message=message)
+                                for b in sbqs:
+                                    print(f" - {b}")
                                 sbqs[0]
-                            elif len(sbqs) <= 0:
-                                message = f" ! ZERO SurvexBlocks matching Entrance point {blockpath} {sid} '{id}'"
-                                print(message)
-                                stash_data_issue(parser="entrances", message=message)
                         except:
-                            message = f" ! FAIL in getting SurvexBlock matching Entrance point {blockpath} {sid}"
+                            message = f" ! {lineno} FAIL in getting SurvexBlock matching Entrance point {blockpath} {sid}"
                             print(message)
                             stash_data_issue(parser="entrances", message=message)
                     try:
-                        ss = SurvexStation(name=id, block=survexblockroot)
+                        ss = SurvexStation(name=sbid)
                         ss.x = float(x)
                         ss.y = float(y)
                         ss.z = float(z)
                         ss.save()
                         found += 1
                     except:
-                        message = f" ! FAIL to create SurvexStation Entrance point {blockpath} {sid}"
+                        message = f" ! {lineno} FAIL to create SurvexStation Entrance point {blockpath} {sid}"
                         print(message)
                         stash_data_issue(parser="entrances", message=message)
                         raise
     print(f" -  {found} SurvexStation entrances found.")
+    print(f" -  {dups} Duplicated SurvexStation entrances found")
     store_data_issues()