From fdedb89dcd60b5fd860f14effe2dc7cf0b82e4dd Mon Sep 17 00:00:00 2001
From: Sergei <spodshivalov@scmarinetech.com>
Date: Sun, 28 Mar 2021 18:21:15 -0700
Subject: [PATCH] Add XTE-GC to produce XTE w.r.t great circle

---
 sentences/XTE-GC.js | 23 +++++++++++++++++++++++
 sentences/XTE.js    |  2 +-
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 sentences/XTE-GC.js

diff --git a/sentences/XTE-GC.js b/sentences/XTE-GC.js
new file mode 100644
index 0000000..c03674b
--- /dev/null
+++ b/sentences/XTE-GC.js
@@ -0,0 +1,23 @@
+/*
+Cross-track error:
+$IIXTE,A,A,x.x,a,N,A*hh
+ I_Cross-track error in miles, L= left, R= right
+ */
+// to verify
+const nmea = require('../nmea.js')
+module.exports = function (app) {
+  return {
+    title: 'XTE - Cross-track error (w.r.t. Great Circle)',
+    keys: ['navigation.courseGreatCircle.crossTrackError'],
+    f: function (crossTrackError) {
+      return nmea.toSentence([
+        '$IIXTE',
+        'A',
+        'A',
+        nmea.mToNm(crossTrackError).toFixed(3),
+        crossTrackError < 0 ? 'R' : 'L',
+        'N'
+      ])
+    }
+  }
+}
diff --git a/sentences/XTE.js b/sentences/XTE.js
index c6bddf3..28f1f71 100644
--- a/sentences/XTE.js
+++ b/sentences/XTE.js
@@ -7,7 +7,7 @@ $IIXTE,A,A,x.x,a,N,A*hh
 const nmea = require('../nmea.js')
 module.exports = function (app) {
   return {
-    title: 'XTE - Cross-track error',
+    title: 'XTE - Cross-track error (w.r.t. Rhumb line)',
     keys: ['navigation.courseRhumbline.crossTrackError'],
     f: function (crossTrackError) {
       return nmea.toSentence([