diff --git a/public_html/index.html b/public_html/index.html
index 74b3deb..ea9eef5 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -605,7 +605,7 @@
- RC:
+ RC:
n/a
diff --git a/public_html/script.js b/public_html/script.js
index 11faa90..e0666aa 100644
--- a/public_html/script.js
+++ b/public_html/script.js
@@ -1041,6 +1041,8 @@ function refreshSelected() {
$('#selected_nac_v').text(format_nac_v(selected.nac_v));
if (selected.rc == null) {
$('#selected_rc').text("n/a");
+ } else if (selected.rc == 0) {
+ $('#selected_rc').text("unknown");
} else {
$('#selected_rc').text(format_distance_long(selected.rc, DisplayUnits));
}