diff --git a/overlay/opt/emcomm-tools/bin/et-data-winlink b/overlay/opt/emcomm-tools/bin/et-data-winlink
new file mode 100755
index 0000000..987f5b3
--- /dev/null
+++ b/overlay/opt/emcomm-tools/bin/et-data-winlink
@@ -0,0 +1,51 @@
+#!/bin/bash
+# Author  : Gaston Gonzalez
+# Date    : 29 November 2025
+# Updated : 30 November 2025
+# Purpose : Generates a denormalized Winlink RMS channel data set from
+#           Pat Winlink's JSON definition. Each line represents a single
+#           Winlink RMS channel. This generated file is the source for
+#           building the Winlink search index.
+source /opt/emcomm-tools/bin/et-common
+
+RMS_SRC_JSON_FILE=~/.local/share/pat/rmslist.json
+RMS_DATA_OUT_FILE=/opt/emcomm-tools-api/data/rmslist.csv
+
+# Return a denormalized list of RMS stations filtered by the supported
+# Winlink modes in EmComm Tools Community.
+#
+#  0 Packet 1200
+# 41 ARDOP 500
+# 43 ARDOP 2000
+# 50 VARA HF
+# 51 VARA FM
+# 52 VARA FM Wide
+# 54 VARA HF 2750
+
+cat ${RMS_SRC_JSON_FILE} | jq -r '
+  .Gateways[]
+  | . as $gw
+  | $gw.GatewayChannels[]
+  | select(.Mode | IN(0, 41, 43, 50, 51, 52, 54))
+  | [
+      $gw.BaseCallsign,
+      $gw.Callsign,
+      $gw.Latitude,
+      $gw.Longitude,
+      .SupportedModes,
+      .Mode,
+      .Frequency
+    ]
+    | join("|")
+' > ${RMS_DATA_OUT_FILE}
+
+LINES=$(wc -l $RMS_DATA_OUT_FILE | awk '{print $1}')
+echo "Created RMS dataset: ${RMS_DATA_OUT_FILE} with ${LINES} records."
+echo
+echo -e "${YELLOW}To update the Winlink index, perform the following as your normal user:${NC}"
+echo
+echo -e "${RED}DO NOT RUN THESE AS ROOT!${NC}"
+echo
+echo -e "${YELLOW}1. Stop the ETC API:  ${WHITE}systemctl --user stop et-service-et-api${NC}"
+echo -e "${YELLOW}2. Remove the old index: ${WHITE}rm -rf /opt/emcomm-tools-api/index/rmslist${NC}"
+echo -e "${YELLOW}3. Start the ETC API: ${WHITE}systemctl --user start et-service-et-api${NC}"