diff --git a/update b/update
index 7aa04e5a..f0d2d72b 100755
--- a/update
+++ b/update
@@ -227,6 +227,31 @@ git pull --no-rebase > .updated_p
 
 #fi
 
+changed=0
+value=`cat /home/pi/CubeSatSim/sim.cfg`
+echo "$value" > /dev/null
+set -- $value
+
+if [ -z "$1" ] ; then n1="AMSAT" ; changed=1 ; else n1=$1 ; fi # callsign
+if [ -z "$2" ] ; then n2="0" ; changed=1 ; else n2=$2 ; fi # reset count
+if [ -z "$3" ] ; then n3="0" ; changed=1 ; else n3=$3 ; fi # lat
+if [ -z "$4" ] ; then n4="0" ; changed=1 ; else n4=$4 ; fi # lon
+if [ -z "$5" ] ; then n5="no" ; changed=1 ; else n5=$5 ; fi # sim mode
+if [ -z "$6" ] ; then n6="3" ; changed=1 ; else n6=$6 ; fi # squelch
+if [ -z "$7" ] ; then n7="434.9000" ; changed=1 ; else n7=$7 ; fi # transmit frequency
+if [ -z "$8" ] ; then n8="436.0000" ; changed=1 ; else n8=$8 ; fi # receive frequency
+if [ -z "$9" ] ; then n9="no" ; changed=1 ; else n9=$9 ; fi # hab mode
+
+if [ $changed -eq 1 ]; then
+	echo -e "Current sim.cfg configuration file:"	
+	echo
+	echo $1 $2 $3 $4 $5 $6 $7 $8 $9
+	echo -e "\nCubeSatSim configuraation sim.cfg file updated to: \n"
+	echo
+	echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9
+	echo $n1 $n2 $n3 $n4 $n5 $n6 $n7 $n8 $n9 > /home/pi/CubeSatSim/sim.cfg
+	echo
+fi
 
 if [ $FLAG -eq 1 ]; then
   echo "systemctl daemon-reload and reboot"