From 65d7d3f5a88790f1368189350554babbeba71c59 Mon Sep 17 00:00:00 2001
From: Fang Wu <fang.wu1988@gmail.com>
Date: Wed, 26 Sep 2018 12:50:27 -0400
Subject: [PATCH]  Check for negative values of altitude 	modified:  
 src/rosbuzz/src/roscontroller.cpp

---
 src/roscontroller.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/roscontroller.cpp b/src/roscontroller.cpp
index db83311..355e338 100644
--- a/src/roscontroller.cpp
+++ b/src/roscontroller.cpp
@@ -44,7 +44,7 @@ logical_clock(ros::Time()), previous_step_time(ros::Time())
   SetStreamRate(0, 10, 1);
 
   //  Get Home position - wait for none-zero value
-  while (cur_pos.latitude == 0.0f)
+  while ((cur_pos.latitude == 0.0f) || (cur_pos.altitude < -1000.0))
   {
     ROS_INFO("Waiting for GPS. ");
     ros::Duration(0.5).sleep();