OK...I hv done 3 days of extensive testing on the GPS signal accuracy between HP6515 & P535. (Both using ext antenna)

For HP6515 the accuracy data showed better result than P535 i.e avg 4M-5.7M compare to Avg of 6.8M to 7.9M on P535.

However when I plotted the so caled better accuracy data of HP6515 compare to P535...The results are totally opposite!! i.e on P535, the line & curve of my collected track is superb & almost perfect or in malsingmaps term ..."golden track" but on HP6515..the track is a bit jagged and occasionally jumped especially when the accuracy dropped to >8M at certain time.

So getting to like this sirfIII chip liow....atlast I'm achieving golden track quality....who care about the accuracy data...   ...Hmnnnn to think of it the accuracy data between 1 machine to another is inaccurate...  

Another thing noted was, P535 see more satelites comapre to HP6515 i.e on avg about 12 in P535 compare to 8 in HP

BTW, I bot mine also at RM2388 wth 2Gb & screen protector...That was the best price after surveying the whole Lowyat!!  ..Abit worry on the 2nd hand value if distributor keep on dropping the price... ..Infact saw a 2nd hand unit w/out complete set selling at only RM1700 recently!!