gps speedo

[sk8rseth]

so i just upgraded my ROM [just found out about it yesterday]
and i see it finally allows us Sprint users to hit that GPS
woo
anyways, i was trying to find a good [free] speedometer app
i found GPS Speedo, love the way it looks, but i cant get it to work
like i hit the GPS(off) button and try to turn it on, but it says "cant open port, port may already be in use"
even when i first turn on my phone.
so i went into tools, then COM and tryed messin around with them, [i have no idea wat COM means] and i finnally got it to say GPS(on) in the corner,
but stillllllllll no readings. whats wrong?
and does anybody else know any good speedometers??