Hi Safdar,
if you're using the navigation stack (move_base bring up this stack), I
suppose that you're using also the amcl package, where the node that you're
using subscribe at "initialpose" topic (see
http://www.ros.org/wiki/amcl#Subscribed_Topics); so you can send an initial
pose message just using rviz (button near "send goal" button). If it doesn't
work, just send a message on "initialpose" topic, using rostopic pub or
creating a new node/publisher that do it. The message should be an
geometry_msgs/PoseWithCovarianceStamped type.

Enea Scioni

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