How often do u listen songs with your e63 everyday using 3.5mm earphone??
Today everyone already using bluetooth headset A2DP. Most ppl i know already bought the i-tech headset

If the person can afford in buying a good expensive 3.5mm earphone they sure can afford a bluetooth headset.
I currently using Nokia BH-503 excellent quality on the E71 due to the phone 1500 mAh battery

GPS is more an ideal thing very simple

With garmin u will never get lost

2nd u can to save new places you wish to go again

3rd you can find food,restoran,petrol kiosk , etc etc with a click and navigate to that place without hassle

4th Travel around without asking direction

5th save your client or friends house/ office location so in future if u need to go this place its just a click away

6th on highway know where there is speedtrap or jam

7th Give another GPS user your location on how to get to your place

8th Turn by Turn direction to your destination or search any addresses without a map or asking someone direction

9th Check your average speed and distance

10th Do tracking maps of your journey

11th geotagging so in future u know where exactly u took a video or photo
so do you think a 3.5mm earphone can replace all the GPS features build in?

what cable you are looking, CA-101 (data cable) or CA-126 (USB charging cable)?