GlobalSat
www.globalsat.com.tw
What is GPS?
GPS stands for Global Positioning System. For 3D fix, we need at least
four satellites. Normally the accuracy of GPS under open sky which
means no tall building and clear sky is within 10 meters per second.
Therefore, if the device shift 10 meter at that second, the device may
shows 36 kilometer per hour instant speed. Nowadays, the GPS
consumer product has built in adjust algorithm and assisted method
to extend capability of GPS.
What is IPX4?
The IPX4 waterproof standard is for device to protect against
splashing water without any adverse operational effects. Waterproof
standards usually measure by the pressure of water. IPX4 standard
provides device protection for under raining weather, and spray water.
The consumer usually misunderstands the waterproof standard of
IPX4 and misuse the IPX4 device with water activities like swimming.
However, the pressure of swimming usually exceeds IPX4 standard.
