You might need to give a little bit more details.
-What kind of GPS-receiver did you purchase?
-What PSP do you have, and which FW?
-Which version of Mapthis do you use?
-Did you check the configuration in Mapthis?
Try to read the startersguide on the forum, it really helps you to get your mapthis up and running.
There's also a readme in the ZIP-file of Map-this you downloaded, also try to read that first
EDIT: INstruction-movie on how to get Mapthis! running
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