From 0f7be536edc7c64d5fe0c0b90cf7521fd5741d40 Mon Sep 17 00:00:00 2001
From: robertl <robertl>
Date: Sun, 13 Aug 2006 21:40:35 +0000
Subject: [PATCH] Fix crash of certain D108 Garmins when writing routes.

---
 garmin.c       | 6 ++++++
 jeeps/gpsapp.c | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/garmin.c b/garmin.c
index 054c9c28e..4698f7d7f 100644
--- a/garmin.c
+++ b/garmin.c
@@ -705,6 +705,12 @@ route_waypt_pr(const waypoint *wpt)
 	if (wpt->altitude != unknown_alt) {
 		rte->alt = wpt->altitude;
 	}
+	if (wpt->altitude != unknown_alt) {
+		rte->alt = wpt->altitude;
+	} else {
+		rte->alt_is_unknown = 1;
+		rte->alt = 0;
+	}
 	strncpy(rte->ident, wpt->shortname, sizeof(rte->ident));
 	rte->ident[sizeof(rte->ident)-1] = 0;
 
diff --git a/jeeps/gpsapp.c b/jeeps/gpsapp.c
index 204d198b9..104f535c7 100644
--- a/jeeps/gpsapp.c
+++ b/jeeps/gpsapp.c
@@ -2063,7 +2063,11 @@ static void GPS_D108_Send(UC *data, GPS_PWay way, int32 *len)
     GPS_Util_Put_Int(p,(int32)GPS_Math_Deg_To_Semi(way->lon));
     p+=sizeof(int32);
 
-    GPS_Util_Put_Float(p,way->alt);
+    if (way->alt_is_unknown) {
+	GPS_Util_Put_Float(p,(const float) 1.0e25);
+    } else {
+	GPS_Util_Put_Float(p,way->alt);
+    }
     p+=sizeof(float);
     GPS_Util_Put_Float(p,way->dpth);
     p+=sizeof(float);
-- 
2.30.2