diff --git a/.env.example b/.env.example
index af5cb5d..b9beabf 100644
--- a/.env.example
+++ b/.env.example
@@ -47,6 +47,10 @@ WEEWX_WEEK_START=0
 # Options: 'us' (Fahrenheit, inches, etc.), 'metric' (Celsius, mm, etc.), 'metricwx' (meteorological metric)
 WEEWX_UNIT_SYSTEM=metric
 
+# Custom unit for pressure group - defaults for metric mbar
+# Options: inHg, mbar, hPa, kPa
+WEEWX_PRESSURE_UNIT = mbar
+
 # Language and Localization
 # Language code for WeeWX interface (en, de, fr, es, it, etc.)
 WEEWX_LANGUAGE=en
diff --git a/docker-compose.yml b/docker-compose.yml
index ce1aa79..a8bbf6b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -11,7 +11,7 @@ services:
       context: .
       dockerfile: Dockerfile.init
     volumes:
-      - weewx_data:/data
+      - /opt/weewx:/data
     environment:
       - PATH=/opt/venv/bin:/usr/local/bin:/usr/bin:/bin
       - PIP_TARGET=/data/lib/python/site-packages
@@ -25,6 +25,7 @@ services:
       - WEEWX_RAIN_YEAR_START=${WEEWX_RAIN_YEAR_START:-1}
       - WEEWX_WEEK_START=${WEEWX_WEEK_START:-0}
       - WEEWX_UNIT_SYSTEM=${WEEWX_UNIT_SYSTEM:-metric}
+      - WEEWX_PRESSURE_UNIT=${WEEWX_PRESSURE_UNIT:-mbar}
       - WEEWX_LANGUAGE=${WEEWX_LANGUAGE:-en}
       - WEEWX_TIMEZONE=${WEEWX_TIMEZONE:-}
       # Extension configuration
@@ -48,7 +49,7 @@ services:
       weewx-init:
         condition: service_completed_successfully
     volumes:
-      - weewx_data:/data
+      - /opt/weewx:/data
     environment:
       - GW1000_IP=${GW1000_IP:-192.168.1.10}
     restart: unless-stopped
@@ -62,7 +63,7 @@ services:
     ports:
       - "${NGINX_PORT:-8080}:80"
     volumes:
-      - weewx_data:/data:ro
+      - /opt/weewx:/data:ro
     command: >
       sh -c "
         cp /data/nginx/nginx.conf /etc/nginx/nginx.conf &&
diff --git a/init/configure-weewx.sh b/init/configure-weewx.sh
index 062b1a1..59adfe6 100755
--- a/init/configure-weewx.sh
+++ b/init/configure-weewx.sh
@@ -62,6 +62,18 @@ if [ -n "$WEEWX_LANGUAGE" ] && [ "$WEEWX_LANGUAGE" != "en" ]; then
     /init/weewx_config_api.py set-value "[StdReport][Defaults]" "lang" "$WEEWX_LANGUAGE"
 fi
 
+# If env variable for custom pressure unit set - apply config
+if [ -n "$WEEWX_PRESSURE_UNIT" ]; then
+
+    echo "Removing [StdReport][Defaults][Units][Groups]"
+    /init/weewx_config_api.py remove-section "[StdReport][Defaults][Units][Groups]"
+    echo "Recreating clean [StdReport][Defaults][Units][Groups]"
+    /init/weewx_config_api.py create-section "[StdReport][Defaults][Units][Groups]"
+    echo "Applying custom pressure unit: $WEEWX_PRESSURE_UNIT"
+    /init/weewx_config_api.py set-value "[StdReport][Defaults][Units][Groups]" "unused" "unused"
+    /init/weewx_config_api.py set-value "[StdReport][Defaults][Units][Groups]" "group_pressure" "$WEEWX_PRESSURE_UNIT"
+fi
+
 # Handle station_url (ConfigObj handles both commented and uncommented cases)
 if [ -n "$WEEWX_STATION_URL" ]; then
     echo "Setting station URL: $WEEWX_STATION_URL"
diff --git a/init/extensions.d/belchertown/2_configure.sh b/init/extensions.d/belchertown/2_configure.sh
index b032d65..89657af 100755
--- a/init/extensions.d/belchertown/2_configure.sh
+++ b/init/extensions.d/belchertown/2_configure.sh
@@ -58,7 +58,8 @@ configure_belchertown_options() {
                 /init/weewx_config_api.py remove-section "[StdReport][Belchertown][Extras]"
             fi
             /init/weewx_config_api.py create-section "[StdReport][Belchertown][Extras]"
-            
+
+	                
             # Set Belchertown Extras options (for manifest and site title)
             /init/weewx_config_api.py set-multiple-values "[StdReport][Belchertown][Extras]" \
                 "site_title=$WEEWX_LOCATION" \