Im running this example script and I cant seem to get it reading more than 5Hz.
What am I missing ? The Teensy is connected via the I2C lead, the GPS is recognised immediately but 5Hz is what I was able to get from the cheap chinese GPS I was using. I bought this for use on circuit where speeds are in excess of 170MPH and 5Hz simply isn`t good enough.
Any suggestions are welcome !
/*
Set update rate to 10Hz
By: Nathan Seidle
SparkFun Electronics
Date: January 3rd, 2019
License: MIT. See license file for more information but you can
basically do whatever you want with this code.
This example shows how to increase the output of the module from 1Hz to 4Hz.
The max output rate various from model to model. RTFM! But you cannot do harm
to the module.
We also disable NMEA output on the I2C bus and use only UBX. This dramatically
decreases the amount of data that needs to be transmitted.
Leave NMEA parsing behind. Now you can simply ask the module for the datums you want!
Feel like supporting open source hardware?
Buy a board from SparkFun!
ZED-F9P RTK2: https://www.sparkfun.com/products/15136
NEO-M8P RTK: https://www.sparkfun.com/products/15005
SAM-M8Q: https://www.sparkfun.com/products/15106
Hardware Connections:
Plug a Qwiic cable into the GNSS and a BlackBoard
If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
Open the serial monitor at 115200 baud to see the output
*/
#include <Wire.h> //Needed for I2C to GNSS
#include <SparkFun_u-blox_GNSS_Arduino_Library.h> //http://librarymanager/All#SparkFun_u-blox_GNSS
SFE_UBLOX_GNSS myGNSS;
unsigned long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to u-blox module.
unsigned long startTime = 0; //Used to calc the actual update rate.
unsigned long updateCount = 0; //Used to calc the actual update rate.
void setup()
{
Serial.begin(115200);
while (!Serial); //Wait for user to open terminal
Serial.println("SparkFun u-blox Example");
Wire.begin();
// Increase I2C clock speed to 400kHz to cope with the high navigation rate
// (We normally recommend running the bus at 100kHz)
Wire.setClock(400000);
if (myGNSS.begin() == false) //Connect to the u-blox module using Wire port
{
Serial.println(F("u-blox GNSS not detected at default I2C address. Please check wiring. Freezing."));
while (1);
}
myGNSS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
myGNSS.setNavigationFrequency(25); //Set output to 25 times a second
uint8_t rate = myGNSS.getNavigationFrequency(); //Get the update rate of this module
Serial.print("Current update rate: ");
Serial.println(rate);
startTime = millis();
}
void loop()
{
//Query module every 25 ms. Doing it more often will just cause I2C traffic.
//The module only responds when a new position is available. This is defined
//by the update freq.
if (millis() - lastTime > 25)
{
lastTime = millis(); //Update the timer
long latitude = myGNSS.getLatitude();
Serial.print(F("Lat: "));
Serial.print(latitude);
long longitude = myGNSS.getLongitude();
Serial.print(F(" Long: "));
Serial.print(longitude);
updateCount++;
//Calculate the actual update rate based on the sketch start time and the
//number of updates we've received.
Serial.print(F(" Rate: "));
Serial.print( updateCount / ((millis() - startTime) / 1000.0), 2);
Serial.print(F("Hz"));
Serial.println();
}
}
How to write the code is a different issue. 
