Navigator [General] - External GPS antenna?

The HX-1, HN7/6&5 have a pretty strong GPS receiver. If you’re putting it in a “tricky” spot within the vehicle, ie. One which may have an obscured view of the sky (and thus satellites), then the best option is what’s called a re-radiating antenna.

Essentially, this is an external antenna that takes the satellite signals, and transmits them along a wire to an in-vehicle transmitter. Therefore, it brings the satellite signals inside the vehicle.

The advantage is that ANY device inside the vehicle can receive the GPS signals. The (slight) disadvantage is that it is another device requiring a power connection.

GPSOZ sell these; we're sure a quick Google search will throw up many others (such as eBay etc.)