From 78302ecd4dd506be2a066284c577dc9bbd09d5a3 Mon Sep 17 00:00:00 2001
From: Erik Andresen <erik@vontaene.de>
Date: Fri, 17 Feb 2023 18:22:57 +0100
Subject: [PATCH] gpsmagdir boot: magnav check

---
 apps/gpsmagdir/boot.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/apps/gpsmagdir/boot.js b/apps/gpsmagdir/boot.js
index 94daf88ca..b8a58f371 100644
--- a/apps/gpsmagdir/boot.js
+++ b/apps/gpsmagdir/boot.js
@@ -7,6 +7,19 @@
   }, require("Storage").readJSON("gpsmagdir.json", true) || {});
   const CALIBDATA = (settings.compassSrc === 2) ? require("Storage").readJSON("magnav.json",1) || {} : undefined;
 
+  // Check if magnav is installed
+  try {
+    require("magnav");
+  } catch(err) {
+    // not installed, adjust settings to work without magnav
+    if (settings.compassSrc === 2) {
+      settings.compassSrc = 1;
+    }
+    if (settings.tiltCompensation) {
+      settings.tiltCompensation = false;
+    }
+  }
+
   // execute Bangle.resetCompass() after Bangle.setCompassPower();
   if (settings.resetCompassOnPwr) {
     const origSetCompassPower = Bangle.setCompassPower;