External GPS Antenna.

Two questions:
1. Has anyone been able to get a better accuracy than 17m on the iPhone 3GS?
2. Is there any way to connect an external GPS antenna to the phone. When I'm geocaching I don't mind rigging up an antenna to my back pack if needed.

1. On my property, my 3gs seems extremely accurate. Once located, it will follow me up & down the driveway and completely around the property.
2. The only external antenna I'm aware of is the TomTom car kit. Since it needs a 12v power source to operate(I believe?) you'd have to figure out how to adapt-a-fit it to your backpack.

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