I searched and read through some posts, but did not find what I'm looking for. I'm just starting out and I am considering getting a GPS setup (Vista, EMAP, or GPS V) or a GPS add on for my Pocket PC (since it is in color). I have an IPAQ 3850 with 64 MB SD card, 128 MB CF, and dual PCMCIA expansion. How do these add-on GPS work in comparison to the standard GPS? Are they as accurate or have as many features? Thanks.