I have been trying Mapthis! for some time, but not really tested the PSP-290 before I got Go!Explore. I have noticed that if I use a PSP-290 connected directly to the PSP, it takes a long time to get a fix, even if there are more than enough sattelites with a fair amount of signal strenght.
I also have another PSP-290 (bought seperatly) with an extention cable from PCmobile, and it really helps. A test earlyer today showed that with the PSP-290 directly connected to the psp it took a few minutes to get a fix (the manual for Go!Explore says it can take from 5 - 15 min).
With the extention cable, and the PSP-290 about 20 - 30 cm away from the psp, it took under 30 seconds.The wiki book says the psp interferes slightly with the gps, but I think it is more than that. At least for the old fat version.
I have heard of people setting the processor freq lower get less interference and a better signal, but I havent tried that.
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