Thanks for providing the firmware version and the version of your operating system.
Got it. Thanks for the info about not using any third-party program with the BU-353.
Thanks for providing additional details. Based on your explanation, the connection breaks down if you drive through tunnels or driving around in urban area. Actually, what happened was that the GPS fix was lost because you drove through the tunnel or in an urban place. It did not break or lose the connection to the software; instead, the program possibly means that it loses a GPS fix. Perhaps, you could check out user manual of that Garmin software and see what it means.
Since the ideal environment for most of our GPS Receivers is clear, open sky with no tall trees or buildings around, going through the tunnel or urban area blocked the device's access to an open sky. More info can be found here: http://www.usglobalsat.com/forum/index.php?topic=3780.msg9921#msg9921
Just wondering, did it get a fix when you drove out of the tunnel or somewhere where you have a clear access to an open sky?
Also, in order to provide further support, can you please register the product and generate a support ticket? we recommend that you visit our website: (http://www.usglobalsat.com/store/signin.aspx?ReturnURL=/store/support/
). Register your product and generate a "Support Ticket" from within our system.
If you had purchased the item from the USGlobalSat website, you should already have a customer account and password. You can immediately log-in using that info. If you purchased it from one of our authorized resellers, you will need to establish a NEW account at: http://www.usglobalsat.com/store/createaccount.aspx
By working within our support structure, we do not only address your specifc issue in a timely manner, but also maintain a history of your incident to ensure that it is handled with appropriate actions. It's not only now, but for all potential future communications as well.
We again thank you for your patience and cooperation. WARRANTY POLICY
Please read our posted warranty policy, especially on how it pertains to sellers of USGlobalSat product on e-Bay & other unauthorized resellers: http://www.usglobalsat.com/s-131-terms-conditions.aspx#12