diff --git a/telephony/README.md b/telephony/README.md
new file mode 100644
index 0000000..5047f73
--- /dev/null
+++ b/telephony/README.md
@@ -0,0 +1,5 @@
+# Geofence Data Description
+- The file `sats2.dat` contains the geofence data for the intersection of the entire US territory
+and Skylo satellite coverage.
+- Satellite coverage is not available in Hawaii and most parts of Alaska.
+- This data has better fidelity than previous versions.
\ No newline at end of file
diff --git a/telephony/sats2.dat b/telephony/sats2.dat
index 577b7af..ec9a7f4 100644
Binary files a/telephony/sats2.dat and b/telephony/sats2.dat differ