I'm using a USB based USGlobalSat BU353 SiRF III GPS antenna, and I'm experiencing a "flash" or "blink" of the map every second as my position is updated on the map.

Anyone else ever experience this issue?

The antenna baud rate defaults to 4800bps.
I'm using a T60 Thinkpad running XP PRO (32bit).

I've used other antennas <on the same laptop> that did not have this phenomenon.

This is not exclusively a BU-353 problem.

I find this will happen to me, too, when navigating if zoomed out far enough with a map that has got a few dozen (or more) pushpins on it. I use a UMPC with GPS built-in.

A similar topic was posted a while back at the link bellow:

http://www.laptopgpsworld.com/2421-street-labels-gps-arrow-blinking-when-navigating-ms-streets-trips

It is likely not related to your USB GPS BU-353.

Reading the various threads around this subject makes it fairly clear that this (a) is not a hardware issue, (b) IS a 'fault' within Streets and Trips, and (c) is beyond users' capacities to 'work around.' I don't know much about writing such applications but it would seem that there is inadequate display buffering to smoothe the transitions from screenshot to screenshot.

Perhaps a 'fix' to this problem should be added to our long Wish List.