diff --git a/rrlp-ephemeris/get-test-data.sh b/rrlp-ephemeris/get-test-data.sh
new file mode 100755
index 0000000..169f43c
--- /dev/null
+++ b/rrlp-ephemeris/get-test-data.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+DEV=$1
+OUTF=$2
+
+# Change mode
+echo -en "\$PUBX,41,1,0001,0001,9600,0*14\r\n" > ${DEV}
+
+# Wait a little
+sleep 2
+
+# Start dump
+echo -en "\xb5\x62\x01\x02\x00\x00\x03\x0a" | \
+	socat -t5 ${DEV},b9600,raw,clocal=1,echo=0 - > ${OUTF}
+echo -en "\xb5\x62\x0b\x10\x00\x00\x1b\x5c" | \
+	socat -t10 ${DEV},b9600,raw,clocal=1,echo=0 - >> ${OUTF}
+