diff --git a/overlay/etc/default/gpsd b/overlay/etc/default/gpsd
index e1f6363..4c0d930 100644
--- a/overlay/etc/default/gpsd
+++ b/overlay/etc/default/gpsd
@@ -1,4 +1,16 @@
-START_DAEMON="true"
+# Author  : Gaston Gonzalez
+# Date    : 4 October
+# Purpose : GPS configuration for EmComm Tools
+
+# Prevent starting automatically by systemd 
+START_DAEMON="false"
+
+# Prevent the default udev rules from starting gpsd.
+# Custom ET udev rules trigger gpsd
 USBAUTO="false"
+
+# Always use
 DEVICES="/dev/et-gps"
+
+# -n should be used when using GPS as a reference clock
 GPSD_OPTIONS="-n"
diff --git a/overlay/etc/udev/rules.d/80-et-ic705.rules b/overlay/etc/udev/rules.d/80-et-ic705.rules
index b97f4e1..edfa36d 100644
--- a/overlay/etc/udev/rules.d/80-et-ic705.rules
+++ b/overlay/etc/udev/rules.d/80-et-ic705.rules
@@ -1,6 +1,6 @@
 # Author   : Gaston Gonzalez
 # Date     : 28 September 2024
-# Updated  : 30 September 2024
+# Updated  : 5 October 2024
 # Purpose  : udev rules for the Icom IC-705
 #
 # Preconditions:
@@ -21,11 +21,12 @@ KERNEL=="ttyACM[0-9]*", SUBSYSTEM=="tty", ATTRS{product}=="IC-705", \
 # Create consistent device name/path for the CAT serial device
 ENV{ET_DEVICE}=="IC-705", SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="00", \
     ACTION=="add", \
-    ENV{ET_SUBDEVICE}="CAT" GROUP="dialout", MODE="0660", SYMLINK+="et-cat"
+    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat"
 
 # Create consistent device name/path for the GPS serial device
 ENV{ET_DEVICE}=="IC-705", SUBSYSTEMS=="usb", ATTRS{bInterfaceNumber}=="02", \
     ACTION=="add", \
-    ENV{ET_SUBDEVICE}="GPS" GROUP="dialout", MODE="0660", SYMLINK+="et-gps"
+    ENV{ET_SUBDEVICE}="GPS", GROUP="dialout", MODE="0660", SYMLINK+="et-gps", \
+    RUN+="/opt/emcomm-tools/sbin/wrapper-gpsd.sh start"
 
 # TODO: Add rules for sound card
diff --git a/overlay/etc/udev/rules.d/82-et-ic7100.rules b/overlay/etc/udev/rules.d/82-et-ic7100.rules
index 4301b65..fd73b38 100644
--- a/overlay/etc/udev/rules.d/82-et-ic7100.rules
+++ b/overlay/etc/udev/rules.d/82-et-ic7100.rules
@@ -1,7 +1,7 @@
 # Author   : Gaston Gonzalez
 # Author   : William McKeehan (https://github.com/mckeehan) 
 # Date     : 30 September 2024
-# Updated  : 1 October 2024
+# Updated  : 5 October 2024
 # Purpose  : udev rules for the Icom IC-7100
 #
 # Preconditions:
@@ -21,12 +21,13 @@ KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", ATTRS{serial}=="IC-7100*", \
 ENV{ET_DEVICE}=="IC-7100", SUBSYSTEMS=="usb", ATTRS{serial}=="IC-7100*A", \
     ACTION=="add", \
     ENV{SYSTEMD_WANTS}="", \
-    ENV{ET_SUBDEVICE}="CAT" GROUP="dialout", MODE="0660", SYMLINK+="et-cat"
+    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat"
 
 # Create consistent device name/path for the GPS serial device
 ENV{ET_DEVICE}=="IC-7100", SUBSYSTEMS=="usb", ATTRS{serial}=="IC-7100*B", \
     ACTION=="add", \
-    ENV{ET_SUBDEVICE}="GPS" GROUP="dialout", MODE="0660", SYMLINK+="et-gps"
+    ENV{ET_SUBDEVICE}="GPS", GROUP="dialout", MODE="0660", SYMLINK+="et-gps", \
+    RUN+="/opt/emcomm-tools/sbin/wrapper-gpsd.sh start"
 
 # TODO: Add rules to trigger rigctld
 # TODO: Add rules for ACTION="remove"
diff --git a/overlay/etc/udev/rules.d/91-et-u-blox.rules b/overlay/etc/udev/rules.d/91-et-u-blox.rules
index a668aeb..05e6812 100644
--- a/overlay/etc/udev/rules.d/91-et-u-blox.rules
+++ b/overlay/etc/udev/rules.d/91-et-u-blox.rules
@@ -1,9 +1,12 @@
 # Author   : Gaston Gonzalez
 # Date     : 30 September 2024
+# Updated  : 5 October 2024
 # Purpose  : udev rules for U-blox GPS
 #
 # Supported Devices
-# 1. VK-162 G-Mouse USB GPS Dongle - https://amzn.to/3XQqmYj
+# 1. VK-162 G-Mouse USB GPS - https://amzn.to/3XQqmYj
+# 2. VK-172 G-Mouse USB GPS - https://amzn.to/3Ya7Viu
+# 3. VFAN UG-353 - https://amzn.to/3XL2lSo 
 #
 # Preconditions:
 # 1. GPS connected via USB cable
@@ -15,6 +18,6 @@
 SUBSYSTEM=="tty", ATTRS{product}=="u-blox*" ATTRS{idVendor}=="1546", ATTRS{idProduct}=="01a7", \
     ACTION=="add", \
     ENV{ET_DEVICE}="UBLOX", ENV{ET_SUBDEVICE}="GPS", \
-    GROUP="dialout", MODE="0660", SYMLINK+="et-gps"
-
+    GROUP="dialout", MODE="0660", SYMLINK+="et-gps", \
+    RUN+="/opt/emcomm-tools/sbin/wrapper-gpsd.sh start"
 
diff --git a/overlay/opt/emcomm-tools/sbin/wrapper-gpsd.sh b/overlay/opt/emcomm-tools/sbin/wrapper-gpsd.sh
new file mode 100755
index 0000000..47e217d
--- /dev/null
+++ b/overlay/opt/emcomm-tools/sbin/wrapper-gpsd.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 4 October 2024
+# Purpose : Wrapper startup/shutdown script around systemd/gpsd 
+
+WAIT=5
+
+start() {
+  et-log "Waiting to start gpsd for ${WAIT} seconds..."
+  sleep ${WAIT}
+  /usr/bin/systemctl restart gpsd
+}
+
+stop() {
+  et-log "Waiting to stop gpsd for ${WAIT} seconds..."
+  sleep ${WAIT}
+  /usr/bin/systemctl stop gpsd
+}
+
+usage() {
+  echo "usage: $(basename $0) <cmd>"
+  echo "  <cmd>  [start|stop]"
+}
+
+if [ $# -ne 1 ]; then
+  usage
+  exit 1
+fi
+
+case $1 in
+  start)
+    start
+    ;;
+  stop)
+    stop
+    ;;
+  *)
+    usage
+  ;;
+esac
diff --git a/scripts/install-base.sh b/scripts/install-base.sh
index aee7dc7..2e53ace 100755
--- a/scripts/install-base.sh
+++ b/scripts/install-base.sh
@@ -2,11 +2,22 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 16 March 2024
-# Updated : 17 May 2024
+# Updated : 4 October 2024
 # Purpose : Install base tools
 set -e
 
-et-log "Installing message of the day"
+et-log "Installing environment variables"
+grep ET_TEMP_DIR /etc/environment
+if [ $? -ne 0 ]; then
+  echo "ET_TEMP_DIR=/tmp/et" >> /etc/environment
+fi
+
+grep ET_LOG_FILE /etc/environment
+if [ $? -ne 0 ]; then
+  echo "ET_LOG_FILE=/tmp/et/et.log" >> /etc/environment
+fi
+
+et-log "Installing message of the day
 cp -v ../overlay/etc/motd /etc/
 
 et-log "Installing base packages"
diff --git a/scripts/install-gps.sh b/scripts/install-gps.sh
index 4261832..ede7e4c 100755
--- a/scripts/install-gps.sh
+++ b/scripts/install-gps.sh
@@ -22,8 +22,8 @@ et-log "Updating gpsd systemd script..."
 cp ../overlay/lib/systemd/system/gpsd.service /lib/systemd/system/
 systemctl daemon-reload
 
-et-log "Enabling gpsd..."
-systemctl enable gpsd
+et-log "Disable automatic start of gpsd..."
+systemctl disable gpsd
 
 et-log "Updating chronyd to support GPS as a time source..."
 echo "# ET: Enable GPS as a time source" >> /etc/chrony/chrony.conf