The NMEA sentence update rate can be increased to 10Hz(10 times a second). The default is 1Hz (Once a second).
When increasing the update rate, you will also need to increase the baud rate.
To change the baud rate to 115200;
echo -e -n "\xB5\x62\x06\x00\x14\x00\x01\x00\x00\x00\xD0\x08\x00\x00\x00\xC2\x01\x00\x07\x00\x03\x00\x00\x00\x00\x00\xC0\x7E" > /dev/serial0
If you need to update the speed on the Raspberry Pi serial port, you can use;
stty -F /dev/serial0 115200
To increase update rate to 2Hz;
echo -e -n "\xB5\x62\x06\x08\x06\x00\xF4\x01\x01\x00\x01\x00\x0B\x77" > /dev/serial0
To increase update rate to 5Hz;
echo -e "\xB5\x62\x06\x08\x06\x00\xC8\x00\x01\x00\x01\x00\xDE\x6A" > /dev/serial0
To increase update rate to 10Hz;
echo -e "\xB5\x62\x06\x08\x06\x00\x64\x00\x01\x00\x01\x00\x7A\x12" > /dev/serial0
In uCenter, the setting can be found under UBX -> CFG -> RATE
The UBX protocol is documented here.