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I tried hector gps too but i had some errors. But when i simply added this plugin in my URDF:

      <!-- GPS Sensor -->
<gazebo>
<plugin name="novatel_gps_sim" filename="libhector_gazebo_ros_gps.so">
<alwaysOn>1</alwaysOn>
<updateRate>10.0</updateRate>
<bodyName>base_footprint</bodyName>
<topicName>fix</topicName>
<velocityTopicName>fix_velocity</velocityTopicName>
<drift>5.0 5.0 5.0</drift>
<gaussianNoise>0.1 0.1 0.1</gaussianNoise>
<velocityDrift>0 0 0</velocityDrift>
<velocityGaussianNoise>0.1 0.1 0.1</velocityGaussianNoise>
</plugin>
</gazebo>


my problem solved. Base_footprint is a link that the gps is attached to in this users URDF file. Hope this helps.