diff --git a/app/admin.py b/app/admin.py
index 9c0caf5..6050a74 100644
--- a/app/admin.py
+++ b/app/admin.py
@@ -162,7 +162,7 @@ class RangeAdmin(admin.ModelAdmin):
                 ('range_name_ascii', 'GMBA_v1_id'),
                 ('latitude', 'longitude'),
                 ('mother_range', 'wiki_data_id', 'area'),
-                ('feature', 'range_alternate_id', 'gmba_narrow'),
+                ('feature', 'range_alternate_id'),
                 'source',
                 'id',
             )
diff --git a/app/management/commands/import.py b/app/management/commands/import.py
index 5d3952e..e7d83cb 100644
--- a/app/management/commands/import.py
+++ b/app/management/commands/import.py
@@ -455,6 +455,9 @@ def handle_object_dict(object_dict, model_name, debug=False):
         for i in ['select_300']:
             if i in object_dict:
                 object_dict[i] = True if object_dict[i].lower().strip() == 'x' else False
+        for i in ['gmba_narrow']:
+            if i in object_dict:
+                object_dict[i] = True if object_dict[i].lower().strip() == 'x' else False
         # area field can't be empty
         if 'area' in object_dict:
             if object_dict['area'] == '':
diff --git a/app/models.py b/app/models.py
index ea6b2c3..0f88bb4 100644
--- a/app/models.py
+++ b/app/models.py
@@ -120,7 +120,7 @@ class MountainRange(models.Model):
     wiki_data_id = models.CharField(blank=True, null=True, max_length=25)
     wiki_data_url = models.TextField(blank=True, null=True)
     select_300 = models.BooleanField(default=False)
-    gmba_narrow = models.CharField(blank=True, null=True, max_length=12)
+    gmba_narrow = models.BooleanField(default=False, verbose_name="GMBA Standard")
     name_fr = models.CharField(blank=True, null=True, max_length=128)
     name_de = models.CharField(blank=True, null=True, max_length=128)
     name_es = models.CharField(blank=True, null=True, max_length=128)