TinyGPS++ distance between

I’ve been trying to measure the distance between two points using tinygps++. The code is an adapted version of the device example. It is modified to work with my board, A SAMD21 mini breakout. The line for distanceBetween was added later. When I upload the code, the distance is outputed as 9404989.55
while the distance between my two points is about 30 metres, or 100 feet.

This is the code

#include <TinyGPS++.h>
//#include <SoftwareSerial.h>
/*
   This sample sketch demonstrates the normal use of a TinyGPS++ (TinyGPSPlus) object.
   It requires the use of SoftwareSerial, and assumes that you have a
   4800-baud serial GPS device hooked up on pins 4(rx) and 3(tx).
*/
//static const int RXPin = 4, TXPin = 3;
static const uint32_t GPSBaud = 9600;

float landingLat = 45.478922;
float landingLng = 73.627075;

// The TinyGPS++ object
TinyGPSPlus gps;

// The serial connection to the GPS device
//SoftwareSerial ss(RXPin, TXPin);

void setup()
{

  SerialUSB.begin(115200);
  Serial1.begin(GPSBaud);

  while(!SerialUSB){}
  while(!Serial1){}

  SerialUSB.println(F("DeviceExample.ino"));
  SerialUSB.println(F("A simple demonstration of TinyGPS++ with an attached GPS module"));
  SerialUSB.print(F("Testing TinyGPS++ library v. ")); SerialUSB.println(TinyGPSPlus::libraryVersion());
  SerialUSB.println(F("by Mikal Hart"));
  SerialUSB.println();
}

void loop()
{
  // This sketch displays information every time a new sentence is correctly encoded.
  while (Serial1.available() > 0){
    if (gps.encode(Serial1.read()))
      displayInfo();
  }

  if (millis() > 5000 && gps.charsProcessed() < 10)
  {
    SerialUSB.println(F("No GPS detected: check wiring."));
    while(true);
  }
}

void displayInfo()
{
  SerialUSB.print(F("Location: ")); 
  if (gps.location.isValid())
  {
    SerialUSB.print(gps.location.lat(), 10);
    SerialUSB.print(F(","));
    SerialUSB.print(gps.location.lng(), 10);
    SerialUSB.print(F(", Distance to point: "));
    SerialUSB.println(TinyGPSPlus::distanceBetween(gps.location.lat(), gps.location.lng(), landingLat, landingLng));
  }
  else
  {
    SerialUSB.print(F("INVALID"));
  }

  SerialUSB.print(F("  Date/Time: "));
  if (gps.date.isValid())
  {
    SerialUSB.print(gps.date.month());
    SerialUSB.print(F("/"));
    SerialUSB.print(gps.date.day());
    SerialUSB.print(F("/"));
    SerialUSB.print(gps.date.year());
  }
  else
  {
    SerialUSB.print(F("INVALID"));
  }

  SerialUSB.print(F(" "));
  if (gps.time.isValid())
  {
    if (gps.time.hour() < 10) SerialUSB.print(F("0"));
    SerialUSB.print(gps.time.hour());
    SerialUSB.print(F(":"));
    if (gps.time.minute() < 10) SerialUSB.print(F("0"));
    SerialUSB.print(gps.time.minute());
    SerialUSB.print(F(":"));
    if (gps.time.second() < 10) SerialUSB.print(F("0"));
    SerialUSB.print(gps.time.second());
    SerialUSB.print(F("."));
    if (gps.time.centisecond() < 10) SerialUSB.print(F("0"));
    SerialUSB.print(gps.time.centisecond());
  }
  else
  {
    SerialUSB.print(F("INVALID"));
  }

  SerialUSB.println();
}

This is a section of the output from the Serial monitor

Location: 45.4790165000,-73.6271450000, Distance to point: 9404989.83
  Date/Time: 2/5/2019 02:06:03.00
Location: 45.4790165000,-73.6271450000, Distance to point: 9404989.83
  Date/Time: 2/5/2019 02:06:03.00
Location: 45.4790165000,-73.6271450000, Distance to point: 9404989.83
  Date/Time: 2/5/2019 02:06:03.00
Location: 45.4790165000,-73.6271450000, Distance to point: 9404989.83
  Date/Time: 2/5/2019 02:06:03.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790180000,-73.6271450000, Distance to point: 9404989.68
  Date/Time: 2/5/2019 02:06:04.00
Location: 45.4790183330,-73.6271446670, Distance to point: 9404989.63
  Date/Time: 2/5/2019 02:06:05.00

Does anyone know why this is happening?

The distance between a point on the earth's surface at 45.4790165000,-73.6271450000 and one at 45.478922, 73.627075 is way more than 30 meters. Get some new batteries for your calculator.

Or, set landingLng to a negative value...

ok, thank you

The two 'locations' were given as 9,400km apart, which might have been a clue, opposite sides of the globe almost.