diff --git a/overlay/etc/skel/.local/share/emcomm-tools/voacap/et-voacap.sh b/overlay/etc/skel/.local/share/emcomm-tools/voacap/et-voacap.sh
new file mode 100755
index 0000000..e01b3d7
--- /dev/null
+++ b/overlay/etc/skel/.local/share/emcomm-tools/voacap/et-voacap.sh
@@ -0,0 +1,315 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 23 May 2023
+# Updated : 24 August 2025
+# Purpose : Offline HF prediction using voacapl
+set -e
+set -o pipefail
+trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
+trap 'echo -e "${RED}\"${last_command}\" command failed with exit code $?.${NC}"' ERR
+
+source /opt/emcomm-tools/bin/et-common
+
+lookup_station() {
+  local type="$1"   # call | grid | latlon
+  local value="$2"  # callsign | grid | "lat,lon"
+  local json_file="$3"
+
+  case "$type" in
+    call)
+      curl -f -s "http://localhost:1981/api/license?callsign=${value}" > "$json_file"
+      if [[ $? -ne 0 ]]; then
+        echo -e "${RED}Location not found for callsign: ${value}.${NC}" >&2
+        return 1
+      fi
+      ;;
+    grid)
+      curl -f -s "http://localhost:1981/api/geo/grid?gridSquare=${value}"  | jq '{lat: .position.lat, lon: .position.lon}' > "$json_file"
+      if [[ $? -ne 0 ]]; then
+        echo -e "${RED}Error converting grid to lat/lon using value: ${value}.${NC}" >&2 
+        return 1
+      fi
+      ;;
+    latlon)
+      # Write directly to JSON for consistency
+      local lat lon
+      IFS=',' read -r lat lon <<< "$value"
+      if [[ -z $lat || -z $lon ]]; then
+        echo -e "${RED}Invalid lat,lon format: $value. Expected 'lat,lon'.${NC}" >&2
+        return 1
+      fi
+      jq -n --arg lat "$lat" --arg lon "$lon" '{lat: ($lat|tonumber), lon: ($lon|tonumber)}' > "$json_file"
+      ;;
+    *)
+      echo -e "${RED}Invalid station type: $type${NC}" >&2
+      return 1
+      ;;
+  esac
+
+  # Extract lat/lon regardless of type
+  local lat lon
+  lat=$(jq .lat "$json_file")
+  lon=$(jq .lon "$json_file")
+
+  echo "$lat $lon"
+}
+
+validate_latitude() {
+  local lat="$1"
+
+  if [[ -z "$lat" ]]; then
+    echo -e "${RED}Latitude can't be an empty value${NC}" >&2
+    return 1
+  fi
+
+  if ! [[ "$lat" =~ ^-?[0-9]+([.][0-9]+)?$ ]]; then
+    echo -e "${RED}Latitude must be a number${NC}" >&2
+    return 1
+  fi
+
+  local latf
+  latf=$(printf "%.10f" "$lat" 2>/dev/null) || {
+    echo -e "${RED}Error converting latitude${NC}" >&2
+    return 1
+  }
+
+  # Check range: -90 <= lat <= 90
+  if (( $(echo "$latf < -90" | bc -l) )) || (( $(echo "$latf > 90" | bc -l) )); then
+    echo -e "${RED}Latitude must be in range between -90 and 90 degrees${NC}" >&2
+    return 1
+  fi
+}
+
+validate_longitude() {
+  local lon="$1"
+
+  if [[ -z "$lon" ]]; then
+    echo -e "${RED}Longitude can't be an empty value${NC}" >&2
+    return 1
+  fi
+
+  if ! [[ "$lon" =~ ^-?[0-9]+([.][0-9]+)?$ ]]; then
+    echo -e "${RED}Longitude must be a number${NC}" >&2
+    return 1
+  fi
+
+  local lonf
+  lonf=$(printf "%.10f" "$lon" 2>/dev/null) || {
+    echo -e "${RED}Error converting longitude ${NC}" >&2
+    return 1
+  }
+
+  # Check range: -180 <= lat <= 1800
+  if (( $(echo "$lon < -180" | bc -l) )) || (( $(echo "$lon > 180" | bc -l) )); then
+    echo -e "${RED}Longitude must be in range between -180 and 180 degrees${NC}" >&2
+    return 1
+  fi
+}
+
+ET_SSN="${HOME}/.local/share/emcomm-tools/voacap/ssn.txt"
+if [[ ! -e ${ET_SSN} ]]; then
+  echo -e "${RED}Sunspot number file not available:${WHITE}${ET_SSN}${NC}"
+  echo -e "${YELLOW}Try running the following to fetch the sunspot numbers (requires Internet):${NC}"
+  echo -e "${WHITE}cd ${HOME}/.local/share/emcomm-tools/voacap${NC}"
+  echo -e "${WHITE}./fetch-ssn.sh${NC}"
+
+  exit 1
+fi
+
+usage() {
+  echo "Usage: $(basename $0) [OPTIONS]"
+  echo
+  echo "Station options (choose one per TX and RX):"
+  echo "  --tx-call CALLSIGN        Transmitting station callsign"
+  echo "  --tx-grid GRID            Transmitting station Maidenhead grid"
+  echo "  --tx-latlon LAT,LON       Transmitting station coordinates in decimal degrees"
+  echo "  --rx-call CALLSIGN        Receiving station callsign"
+  echo "  --rx-grid GRID            Receiving station Maidenhead grid"
+  echo "  --rx-latlon LAT,LON       Receiving station coordinates in decimal degrees"
+  echo
+  echo "Other options:"
+  echo "  -p POWER                  Output power [5|20|100|500|1500]"
+  echo "  -m MODE                   Mode [AM|CW|JS8|SSB]"
+  echo
+
+  exit 1
+}
+
+tx_type="" 
+tx_value=""
+rx_type="" 
+rx_value=""
+power="" 
+mode=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --tx-call)   tx_type="call";   tx_value="$2"; shift 2 ;;
+    --tx-grid)   tx_type="grid";   tx_value="$2"; shift 2 ;;
+    --tx-latlon) tx_type="latlon"; tx_value="$2"; shift 2 ;;
+    --rx-call)   rx_type="call";   rx_value="$2"; shift 2 ;;
+    --rx-grid)   rx_type="grid";   rx_value="$2"; shift 2 ;;
+    --rx-latlon) rx_type="latlon"; rx_value="$2"; shift 2 ;;
+    -p)          power="$2"; shift 2 ;;
+    -m)          mode="$2";  shift 2 ;;
+    -*|--*)      echo "Unknown option: $1"; usage ;;
+    *)           echo "Unexpected argument: $1"; usage ;;
+  esac
+done
+
+# Validate required args
+[[ -z $tx_type || -z $rx_type || -z $power || -z $mode ]] && usage
+
+#echo "TX ($tx_type): $tx_value"
+#echo "RX ($rx_type): $rx_value"
+#echo "Power: $power"
+#echo "Mode: $mode"
+
+# Allow for case-insensitve match of the user-defined operating mode
+MODE=$mode
+case "${MODE,,}" in
+  js8)
+    MD="13.0"
+    ;;
+  cw)
+    MD="24.0"
+    ;;
+  ssb)
+    MD="38.0"
+    ;;
+  am)
+    MD="49.0"
+    ;;
+  *)
+    echo -e "${RED}Unknown mode: ${MODE}${NC}" >&2
+    usage
+    exit 1
+    ;;
+esac
+
+ET_VOA_WORKING_DIR=$HOME/itshfbc/run
+ET_VOA_REPORT=${ET_VOA_WORKING_DIR}/voacapl.txt
+INP=${ET_VOA_WORKING_DIR}/voacapx.dat
+OUT=${ET_VOA_WORKING_DIR}/voacapx.out
+
+# Year = 2023
+YEAR=$(echo $(date '+%Y'))
+
+# Month (May) = 5.00
+MONTH=$(date +'%m')
+MONTH_FMT=$(date +'%-m.00')
+
+#######################################################################
+# TX Antenna
+#######################################################################
+
+if ! result=$(lookup_station "$tx_type" "$tx_value" tx-station.json); then
+  if [[ "$tx_type" == "call" ]]; then
+    echo "Try specifying a grid or lat,lon for the transmitting station."
+    echo "  --tx-grid GRID            Transmitting station Maidenhead grid"
+    echo "  --tx-latlon LAT,LON       Transmitting station coordinates in decimal degrees"
+  fi
+  exit 1
+fi
+read TL TK <<< "$result"
+
+validate_latitude "$TL" || exit 1
+validate_longitude "$TK" || exit 1
+
+TL1=$( awk -v n1=$TL -v n2=90 -v n3=-90 'BEGIN {if (n1<n3 || n1>n2) printf ("%s", "a"); else printf ("%.2f", n1);}' )
+
+# add North or South (N/S)
+TLA=$( awk -v n1=$TL1 -v n2=0 'BEGIN {if (n1<n2) { n1=substr(n1,2); printf ("%6sS", n1); } else printf ("%6sN", n1);}' )
+
+TK1=$( awk -v n1=$TK -v n2=180 -v n3=-180 'BEGIN {if (n1<n3 || n1>n2) printf ("%s", "a"); else printf ("%.2f", n1);}' )
+		    
+# add East or West (E/W)
+TLO=$( awk -v n1=$TK1 -v n2=0 'BEGIN {if (n1<n2) { n1=substr(n1,2); printf ("%7sW", n1); } else printf ("%7sE", n1);}' )
+
+
+#######################################################################
+# RX Antenna
+#######################################################################
+
+if ! result=$(lookup_station "$rx_type" "$rx_value" rx-station.json); then
+  if [[ "$rx_type" == "call" ]]; then
+    echo "Try specifying a grid or lat,lon for the receiving station."
+    echo "  --rx-grid GRID            Receiving station Maidenhead grid"
+    echo "  --rx-latlon LAT,LON       Receiving station coordinates in decimal degrees"
+  fi
+  exit 1
+fi
+read RL RK <<< "$result"
+
+validate_latitude "$RL" || exit 1
+validate_longitude "$RK" || exit 1
+
+RL1=$( awk -v n1=$RL -v n2=90 -v n3=-90 'BEGIN {if (n1<n3 || n1>n2) printf ("%s", "a"); else printf ("%.2f", n1);}' )
+
+# add North or South
+RLA=$( awk -v n1=$RL1 -v n2=0 'BEGIN {if (n1<n2) { n1=substr(n1,2); printf ("%6sS", n1); } else printf ("%6sN", n1);}' )
+
+RK1=$( awk -v n1=$RK -v n2=180 -v n3=-180 'BEGIN {if (n1<n3 || n1>n2) printf ("%s", "a"); else printf ("%.2f", n1);}' )
+
+# add East or West
+RLO=$( awk -v n1=$RK1 -v n2=0 'BEGIN {if (n1<n2) { n1=substr(n1,2); printf ("%7sW", n1); } else printf ("%7sE", n1);}' )
+
+# Power settings 
+# Use 80% of user-defined power and express in killiwatts
+# TODO: Make calculation dynamic. 
+PWR=$power
+PW="0.0800"
+echo "TX Power: ${PWR} watts"
+if [ "$PWR" = "5" ]; then
+  PW="0.0040"
+elif [ "$PWR" = "20" ]; then
+  PW="0.0160"
+elif [ "$PWR" = "100" ]; then
+  PW="0.0800"
+elif [ "$PWR" = "500" ]; then
+  PW="0.4000"
+elif [ "$PWR" = "1500" ]; then
+  PW="1.2000"
+else
+  echo "Unsupported power level."
+  usage
+  exit 1
+fi
+
+# Format for 117
+# NOTE: The card requires <SSN>. (117.)
+ssn=`grep "$YEAR $MONTH" ${ET_SSN} | awk '{print $5}' | cut -d"." -f1`
+
+# read more about fine-tuning your input file:
+# http://www.voacap.com/voacapw.html
+# http://www.voacap.com/frequency.html
+
+echo -e "\n"
+
+cat << END | tee $INP
+LINEMAX     999       number of lines-per-page
+COEFFS    CCIR
+TIME          1   24    1    1
+MONTH      $YEAR $MONTH_FMT
+SUNSPOT    $ssn.
+LABEL     $TX$RX
+CIRCUIT  $TLA  $TLO   $RLA  $RLO  S     0
+SYSTEM       1. 155. 3.00  90. $MD 3.00 0.10
+FPROB      1.00 1.00 1.00 0.00
+ANTENNA       1    1    2   30     0.000[samples/sample.00    ]  0.0    $PW
+ANTENNA       2    2    2   30     0.000[samples/sample.00    ]  0.0    0.0000
+FREQUENCY  3.60 5.30 7.1010.1014.1018.1021.1024.9028.20 0.00 0.00
+METHOD       30    0
+BOTLINES      8   12   21
+TOPLINES      1    2    3    4    6
+EXECUTE
+QUIT
+
+END
+
+voacapl -s ~/itshfbc
+echo "voacapl exited with $? using in=$INP and out=$OUT"
+
+(tail -n +27 $OUT | head -n 5 &&  grep -e'-  REL' $OUT && grep -e'-  S DBW' $OUT) | ./rel.pl > ${ET_VOA_REPORT}
+cat ${ET_VOA_REPORT}
diff --git a/overlay/etc/skel/.local/share/emcomm-tools/voacap/fetch-ssn.sh b/overlay/etc/skel/.local/share/emcomm-tools/voacap/fetch-ssn.sh
new file mode 100755
index 0000000..f0b84c9
--- /dev/null
+++ b/overlay/etc/skel/.local/share/emcomm-tools/voacap/fetch-ssn.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 16 August 2025
+# Purpose : Fetch SSNs for VOACAP prediction
+
+source /opt/emcomm-tools/bin/et-common
+
+FILE="ssn.txt"
+URL="https://www.sidc.be/silso/FORECASTS/prediML.txt"
+curl -s -f -L -o ${FILE} ${URL}
+
+if [[ $? -ne 0 ]]; then
+  echo -e "${RED}Failed to update ${FILE} from: ${URL}."
+  exit 1
+fi
diff --git a/overlay/etc/skel/.local/share/emcomm-tools/voacap/rel.pl b/overlay/etc/skel/.local/share/emcomm-tools/voacap/rel.pl
new file mode 100755
index 0000000..6448585
--- /dev/null
+++ b/overlay/etc/skel/.local/share/emcomm-tools/voacap/rel.pl
@@ -0,0 +1,133 @@
+#!/usr/bin/perl
+# Author: Jari Perkiömäki OH6BG
+# 12 June 2016: initial release
+# 18 June 2016: added Long-Path predictions; use unpack for extracting table data
+# 18 June 2016: added Power, Mode; small improvements
+#
+
+use strict;
+use warnings;
+
+my @relhour  = ();
+my @sdbwhour = ();
+my @co  = ();
+my @mo  = ();
+my @pwr = ();
+my @db = ();
+my $km  = 0;
+my $mi  = 0;
+my $brn = 0;
+my $fh;
+my $voa;
+my $mode;
+my $path = "Short-Path";
+
+# main loop
+open $fh, '>>', \$voa or die $!;
+process ();
+close $fh;
+print $voa;
+exit;
+
+### end ###
+
+sub process {
+    my $format = 'A4 A5 A5 A5 A5 A5 A5 A5 A5 A5';
+    while (<>) {
+
+	    s/^\s+|\s+$//g;
+	    
+	    if ( substr ($_, -1) eq "s" ) { @mo = split /\s+/; }
+	    
+            elsif ( substr ($_, -2) eq "kW" ) { @pwr = split /\s+/; }
+            elsif ( substr ($_, -2) eq "dB" ) {
+             
+            @db = split /\s+/;
+            if ( $db[13] eq "24.0" ) { $mode = "CW"; }
+            elsif ( $db[13] eq "38.0" ) { $mode = "SSB"; }
+            else { $mode = "AM"; }
+            
+            }
+	    
+	    elsif ( /Long/ ) { $path = "Long-Path"; }
+	    
+	    elsif ( substr ($_, -1) =~ /\d/ ) { 
+		
+		    @co = split /\s+/; 
+		    $brn  = sprintf "%d", $co[9] + 0.5; 
+		    $km   = sprintf "%d", $co[12] + 0.5;
+		    $mi   = sprintf "%d", ($co[12] * 0.62137) + 0.5;
+		
+		}
+		
+	    elsif ( substr ($_, -3) eq "REL" ) { push (@relhour, [ unpack( $format, $_ ) ] ); }
+	    elsif ( substr ($_, -3) eq "DBW" ) { push (@sdbwhour,[ unpack( $format, $_ ) ] ); }
+	    
+    } # while 
+    
+    for ($fh) {
+	    print $_ "VOACAP Prediction via $path. $mo[0] $mo[1]: SSN $mo[4] Power = $pwr[$#pwr], $mode\n";
+            print $_ "TX ($co[0]$co[1], $co[2]$co[3]) to RX ($co[5]$co[6], $co[7]$co[8]): $km km, $mi mi, $brn deg\n\n";
+	    print $_ "  | 01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|\n";
+	}
+    
+    foreach my $freq (reverse 1..9) { 
+	    print $fh band($freq) . "|";
+	    foreach my $h (0..23) { print $fh makehourfreq( $h, $freq ); }
+	    print $fh "|" . band($freq) . "\n";
+	}    
+
+    for ($fh) {
+	    print $_ "  | 01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|\n\n";
+	    print $_ "A = 90 - 100%   d = 25 - 49%  * = REL 0%, but Signal Power over Noise\n";
+	    print $_ "B = 75 -  89%   e = 10 - 24%\n";
+	    print $_ "C = 50 -  74%   f =  1 -  9%\n\n";
+	}    
+    
+    @relhour = ();
+    @sdbwhour = ();
+
+    } # process
+
+sub makehourfreq {
+    
+    my $h = $_[0];
+    my $f = $_[1];
+    my $r = $relhour[$h][$f];
+    my $s = $sdbwhour[$h][$f];
+    
+    if ( ($r == 0.00 && $s >= -167) ) {  return " * "; }
+    else { return col($relhour[$h][$f]); }
+    
+    } 
+
+sub band {
+    
+    my $b = $_[0];
+    
+    if ($b == 1) { return "80"; }
+    if ($b == 2) { return "60"; }
+    if ($b == 3) { return "40"; }
+    if ($b == 4) { return "30"; }
+    if ($b == 5) { return "20"; }
+    if ($b == 6) { return "17"; }
+    if ($b == 7) { return "15"; }
+    if ($b == 8) { return "12"; }
+    if ($b == 9) { return "10"; }
+    
+    } 
+
+sub col {
+    
+    my $rel = $_[0]; 
+    
+    if ($rel == 0.00 )                   { return "   "; }
+    elsif ($rel >= 0.01 && $rel < 0.10 ) { return " f "; }
+    elsif ($rel >= 0.10 && $rel < 0.25 ) { return " e "; }
+    elsif ($rel >= 0.25 && $rel < 0.50 ) { return " d "; }
+    elsif ($rel >= 0.50 && $rel < 0.75 ) { return " C "; }
+    elsif ($rel >= 0.75 && $rel < 0.90 ) { return " B "; }
+    elsif ($rel >= 0.90 && $rel < 1.01 ) { return " A "; }
+    else  { return " - "; }
+    
+    } 
\ No newline at end of file
diff --git a/overlay/etc/skel/.local/share/emcomm-tools/voacap/ssn.txt b/overlay/etc/skel/.local/share/emcomm-tools/voacap/ssn.txt
new file mode 100644
index 0000000..d7fd966
--- /dev/null
+++ b/overlay/etc/skel/.local/share/emcomm-tools/voacap/ssn.txt
@@ -0,0 +1,18 @@
+2025 02  2025.122 : 145.4   5.0
+2025 03  2025.204 : 145.5  10.2
+2025 04  2025.286 : 145.0  15.5
+2025 05  2025.371 : 143.1  20.7
+2025 06  2025.453 : 140.9  24.6
+2025 07  2025.538 : 137.3  26.5
+2025 08  2025.623 : 133.1  27.0
+2025 09  2025.705 : 129.4  27.3
+2025 10  2025.790 : 126.1  29.0
+2025 11  2025.873 : 123.2  30.0
+2025 12  2025.958 : 120.8  29.3
+2026 01  2026.042 : 118.0  28.2
+2026 02  2026.122 : 114.6  27.4
+2026 03  2026.204 : 110.4  25.8
+2026 04  2026.286 : 106.1  24.6
+2026 05  2026.371 : 102.1  23.8
+2026 06  2026.453 :  97.8  23.9
+2026 07  2026.538 :  94.0  25.1
diff --git a/overlay/opt/emcomm-tools/bin/et-common b/overlay/opt/emcomm-tools/bin/et-common
index bf45cf8..bc781dd 100755
--- a/overlay/opt/emcomm-tools/bin/et-common
+++ b/overlay/opt/emcomm-tools/bin/et-common
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Author  : Gaston Gonzalez
 # Date    : 1 February 2025
-# Updated : 7 June 2025
+# Updated : 20 August 2025
 # Purpose : Common environment variables and functions
 
 # Standardized device paths for supported hardware
@@ -74,3 +74,70 @@ start_and_wait_for_service() {
   exit_on_service_failure ${systemd_unit_name}
 }
 
+
+# download_with_retries downloads a file from a URL with retry and checksum support.
+#
+# This function attempts to download a file up to a maximum number of retries.
+# If a checksum is provided, the downloaded file will be verified against it.
+# On checksum mismatch, the file is deleted and the download retried.
+#
+# Args:
+#   url: The URL of the file to download. (required)
+#   filename: The local filename to save the file as. (required)
+#   checksum: Optional sha256 checksum string to validate the downloaded file.
+#   max_retries: Optional max number of retries (default: 3).
+#   wait_seconds: Optional wait time in seconds between retries (default: 2).
+#
+# Returns:
+#   0 if the file was successfully downloaded (and checksum verified if given).
+#   1 if arguments are missing, download fails after all retries,
+#     or checksum verification fails.
+#
+# Example:
+#   download_with_retries "https://example.com/file.tar.gz" "file.tar.gz"
+#   download_with_retries "https://example.com/file.tar.gz" "file.tar.gz" "abc123..." 5 3
+download_with_retries() {
+  local url="$1"
+  local filename="$2"
+  local checksum="$3"          # expected checksum (sha256)
+  local max_retries="${4:-3}"  # default = 3 retries
+  local wait_seconds="${5:-2}" # default = 2s wait between retries
+
+  # Require at least URL and filename
+  if [[ -z "$url" || -z "$filename" ]]; then
+    echo "Usage: download_with_retries <url> <filename> [checksum] [max_retries] [wait_seconds]"
+    return 1
+  fi
+
+  for ((i=1; i<=max_retries; i++)); do
+    echo "Attempt $i of $max_retries to download $url..."
+
+    if curl -L -f -o "$filename" "$url"; then
+      echo "Download successful: $filename"
+
+      if [[ -n "$checksum" ]]; then
+        echo "Verifying checksum..."
+        local file_checksum
+        file_checksum=$(sha256sum "$filename" | awk '{print $1}')
+
+        if [[ "$file_checksum" == "$checksum" ]]; then
+          echo "Checksum OK"
+          return 0
+        else
+          echo "Checksum mismatch (expected $checksum, got $file_checksum)"
+          rm -f "$filename"
+        fi
+      else
+        # no checksum provided, just succeed
+        return 0
+      fi
+    else
+      echo "Download failed (attempt $i)."
+    fi
+
+    sleep "$wait_seconds"
+  done
+
+  echo "Download failed after $max_retries attempts."
+  return 1
+}
diff --git a/overlay/opt/emcomm-tools/bin/et-voacap b/overlay/opt/emcomm-tools/bin/et-voacap
new file mode 100755
index 0000000..10f085f
--- /dev/null
+++ b/overlay/opt/emcomm-tools/bin/et-voacap
@@ -0,0 +1,14 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 17 August 2025
+# Purpose : Wrapper script for VOACAP
+
+VOACAP_DIR=${HOME}/.local/share/emcomm-tools/voacap
+CWD_DIR=$(pwd)
+
+cd ${VOACAP_DIR}
+
+./et-voacap.sh $@
+
+cd ${CWD_DIR}
diff --git a/scripts/install-et-aircraft.sh b/scripts/install-et-aircraft.sh
index 806bd1b..7b7531d 100755
--- a/scripts/install-et-aircraft.sh
+++ b/scripts/install-et-aircraft.sh
@@ -1,12 +1,14 @@
 #!/bin/bash
 # Author  : Gaston Gonzalez
 # Date    : 9 July 2025
+# Updated : 20 August 2025
 # Purpose : Install et-aircraft-app
 set -e
 trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
 trap 'et-log "\"${last_command}\" command failed with exit code $?."' ERR
 
 . ./env.sh
+. ../overlay/opt/emcomm-tools/bin/et-common
 
 APP=et-aircraft-app
 VERSION=1.0.0
@@ -18,9 +20,7 @@ if [[ ! -e ${ET_DIST_DIR}/${DOWNLOAD_FILE} ]]; then
 
   URL="https://github.com/thetechprepper/et-aircraft-app/releases/download/${VERSION}/${DOWNLOAD_FILE}"
 
-  et-log "Downloading ${APP}: ${URL}"
-  curl -s -L -o ${DOWNLOAD_FILE} --fail ${URL}
-
+  download_with_retries ${URL} ${DOWNLOAD_FILE}
   mv ${DOWNLOAD_FILE} ${ET_DIST_DIR}
 fi
 
diff --git a/scripts/install-et-api.sh b/scripts/install-et-api.sh
index 29d517d..4829230 100755
--- a/scripts/install-et-api.sh
+++ b/scripts/install-et-api.sh
@@ -1,12 +1,14 @@
 #!/bin/bash
 # Author  : Gaston Gonzalez
 # Date    : 13 August 2025
+# Updated : 20 August 2025
 # Purpose : Install EmComm Tools API
 set -e
 trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
 trap 'et-log "\"${last_command}\" command failed with exit code $?."' ERR
 
 . ./env.sh
+. ../overlay/opt/emcomm-tools/bin/et-common
 
 APP=et-api
 VERSION=1.0.0
@@ -24,17 +26,23 @@ mkdir -v -p "${BIN_DIR}" "${DATA_DIR}" "${INDEX_DIR}"
 
 # Download and install et-api uber JAR
 URL="${BASE_URL}/${ET_API_JAR}"
-et-log "Downloading ${APP}: ${URL}"
-curl -s -L -o "${BIN_DIR}/${APP}" --fail ${URL}
+download_with_retries ${URL} ${APP}
+mv ${APP} ${BIN_DIR}
 chmod 755 "${BIN_DIR}/${APP}"
 
 # Download pre-built data sets
-FILES=("faa.csv" "license.csv" "zip2geo.csv" "zip2geo-elevation.csv")
+FILES=(
+  "faa.csv"
+  "license.csv"
+  "zip2geo.csv"
+  "zip2geo-elevation.csv"
+)
 for file in "${FILES[@]}"; do
   URL="${BASE_URL}/${file}"
 
   et-log "Downloading data set: ${URL}"
-  curl -s -L -o "${DATA_DIR}/${file}" --fail ${URL}
+  download_with_retries ${URL} ${file}
+  mv ${file} ${DATA_DIR}
 done
 
 et-log "Applying permissions..."
diff --git a/scripts/install-voacap.sh b/scripts/install-voacap.sh
new file mode 100755
index 0000000..2e60a61
--- /dev/null
+++ b/scripts/install-voacap.sh
@@ -0,0 +1,52 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 5 June 2023
+# Updated : 16 August 2025
+# Purpose : Install Dire Wolf
+#
+# References:
+# 1. https://github.com/jawatson/voacapl
+# 2. https://github.com/jawatson/voacapl/wiki
+# 3. http://www.greg-hand.com/hfwin32.html
+set -e
+trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG
+trap 'et-log "\"${last_command}\" command failed with exit code $?."' ERR
+
+. ./env.sh
+
+APP=voacapl
+VERSION=0.7.6
+REPO=https://github.com/thetechprepper/voacapl
+REPO_SRC_DIR="/opt/src/${APP}"
+INSTALL_DIR="/opt/${APP}-${VERSION}"
+LINK_PATH="/opt/${APP}"
+
+et-log "Installing voacapl build dependencies..."
+apt install gfortran -y
+
+[[ ! -e ${ET_SRC_DIR} ]] && mkdir ${ET_SRC_DIR}
+
+CWD_DIR=`pwd`
+
+if [[ ! -e ${REPO_SRC_DIR} ]]; then
+  cd ${ET_SRC_DIR} && git clone ${REPO}
+fi
+
+cd ${REPO_SRC_DIR}
+./configure --prefix=${INSTALL_DIR}
+make && make install
+
+# patch prefix location
+sed -i 's|__PREFIX__|/opt/voacapl-0.7.6|' makeitshfbc
+
+[[ -e /root/itshfbc ]] && rm -rf /root/itshfbc
+[[ -e /etc/skel/itshfbc ]] && rm -rf /etc/skel/itshfbc
+
+./makeitshfbc && mv /root/itshfbc /etc/skel
+
+[[ -e ${LINK_PATH} ]] && rm ${LINK_PATH}
+ln -s ${INSTALL_DIR} ${LINK_PATH}
+
+cd ${CWD_DIR}
+
+stow -v -d /opt ${APP} -t /usr/local
diff --git a/scripts/install.sh b/scripts/install.sh
index 51db9d1..655e658 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -2,7 +2,7 @@
 #
 # Author  : Gaston Gonzalez
 # Date    : 16 March 2024
-# Updated : 13 August 2025
+# Updated : 16 August 2025
 # Purpose : Main installer for EmComm Tools Community (ETC)
 
 . ./env.sh
@@ -84,3 +84,6 @@ exitIfNotRoot
 # Install documentation tools
 ./install-dictionary.sh
 #./install-doc-tools.sh
+
+# Install prediction tools
+./install-voacap.sh
diff --git a/tests/test-et-api.sh b/tests/test-et-api.sh
index 919264a..b6d9bee 100755
--- a/tests/test-et-api.sh
+++ b/tests/test-et-api.sh
@@ -1,7 +1,23 @@
 #!/bin/bash
-# Author   : Gaston Gonzalez
-# Date     : 13 August 2025
-# Purpose  : Test et-api installation
+# Author  : Gaston Gonzalez
+# Date    : 13 August 2025
+# Updated : 20 August 2025
+# Purpose : Test et-api installation
+
+FILES=(
+  "faa.csv"
+  "license.csv"
+  "zip2geo.csv"
+  "zip2geo-elevation.csv"
+)
+
+for file in "${FILES[@]}"; do
+  OUT=$(ls /opt/emcomm-tools-api/data/${file} 2>/dev/null)
+  if [[ $? -ne 0 ]]; then
+    echo -e "\t* Required file '$file' does not exist."
+    exit 1
+  fi
+done
 
 OUT=$(ls /opt/emcomm-tools-api/bin/et-api 2>/dev/null)
 exit $?
diff --git a/tests/test-voacap.sh b/tests/test-voacap.sh
new file mode 100755
index 0000000..04836c3
--- /dev/null
+++ b/tests/test-voacap.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+# Author   : Gaston Gonzalez
+# Date     : 16 August 2025
+# Purpose  : Test VOACAP installation
+
+OUT=$(which voacapl)
+exit $?