The unit, which combines a handheld GPS navigational device and a satellite communication system ... devices for navigation. There’s the eTrex SE (£149.99/$149.99) and GPSMAP 64x Series ...

this first step towards a "maritime backup system" in the Baltic Sea has shown "that R-mode technology works in practice as an alternative terrestrial navigation system and makes it possible to ...

Since electronic gyros and accelerometers are all over the place, [Sebastian] thought he would have a go at creating his own inertial navigation system. The difficulty in using this method is that ...