0378ca02__is_Better___Fixed_vs_Portable__ble__PDAs___Tablets___Laptops_
[0] Navigation (GPS) Performance [Fixed (Dedicated Vehicle PC)] Our vehicle PCs support external GPS antennas for the best possible performance. In addition our PCs can carry out dead reckoning - utilising vehicle telemetry to continue to estimate a position when GPS is not available (e.g. in tunnels, forests and around high buildings).
A GPS antenna located anywhere inside the vehicle can never have as good a view of the sky as a roof-mounted antenna, which is necessary for the best performance. For devices with an integrated GPS antenna, the conflict between good ergonomics (requiring the device to be relatively close to the user) and good GPS performance (requiring the device to be as close to the windscreen as possible) is clear.
Why a Car PC is Better | Fixed vs Portable
Portable (PDAs / Tablets / Laptops)