Red dotted line circle around arrow in MapThis

Hi all,
Sorry if this has been already asked...
I've just installed MapThis! 0.5.20 on my PSP phat with Custom Firmware 3.93 M33 + PSP-290 from Sony.
Everything works fine software-wise, but I've noticed a strange thing in GPS-mode: there is now a red dotted-line circle around the position arrow.

The positionning is also weird, i.e. in GPS mode when enough sats are in view, the arrow starts moving towards my real position, then it stops somehow close to my location but not right on spot (maybe 2 kms away from it...)

I've been running Mapthis on the same hardware before (same PSP+same GPS), and didn't have this. I had 3.52 M33-4 and MapThis! 0.5 before.

Any ideas?

Thanks

I get this circle if i lose my signal.

Oh I see... makes sense.... Any detailed info in the wiki? I can't find any....

I added the following line to the wiki: "Depending on the error, a red circle may be shown around the cursor, indicating the current location is approximate."

Hi Nieko,
OK, thanks, it's clear now...