GPS World 2017 February Reader Poll Question Title * 1. Of the following alternative PNT techniques (all mentioned in February's PNT Roundup DARPA article), which has the most promise? (Required.) Inertial sensors Chip-scale atomic clocks Cell signals Low-Earth orbit communications satellites Video cameras Ground-based beacons eLoran Other (please specify) Question Title * 2. Enter GPS World’s random drawing for this poll to win a $50 Visa Gift Card. Name: Company: Country: Email Address: Email Address Again: Done