ADAFRUIT GPS

My loop is at the bottom of this code

#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
const int pwPin1 = 7;
const int pwPin2 = 6;
const int pwPin3 = 4; // Pins for sending PWM to Sonars
//motor A connected between A01 and A02
//motor B connected between B01 and B02
int STBY = 10; //standby
//Motor A
int PWMA = 13 ; //Speed control
int AIN1 = 9; //Direction
int AIN2 = 8; //Direction
//Motor B
int PWMB = 5; //Speed control
int BIN1 = 11; //Direction
int BIN2 = 12; //Direction
long pulse, inches, duration;
String stringOne; 

// If you're using a GPS module:
// Connect the GPS Power pin to 5V
// Connect the GPS Ground pin to ground
//   Connect the GPS TX (transmit) pin to Digital 3
//   Connect the GPS RX (receive) pin to Digital 2
// (you can change the pin numbers to match your wiring):
SoftwareSerial mySerial(3, 2);
// If using hardware serial (e.g. Arduino Mega), comment out the
// above SoftwareSerial line, and enable this line instead
// (you can change the Serial number to match your wiring):
//HardwareSerial mySerial = Serial1;

Adafruit_GPS GPS(&mySerial);

// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences. 
#define GPSECHO  true

// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;
void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
//////////////////////////////////////////////////////////GPS Tracker Begin/////////////////////////////////////////////////////////
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
SIGNAL(TIMER0_COMPA_vect) {
  char c = GPS.read();
  // if you want to debug, this is a good time to do it!
#ifdef UDR0
  if (GPSECHO)
    if (c) UDR0 = c;  
    // writing direct to UDR0 is much much faster than Serial.print 
    // but only one character can be written at a time. 
#endif
}
void useInterrupt(boolean v) {
  if (v) {
    // Timer0 is already used for millis() - we'll just interrupt somewhere
    // in the middle and call the "Compare A" function above
    OCR0A = 0xAF;
    TIMSK0 |= _BV(OCIE0A);
    usingInterrupt = true;
  } else {
    // do not call the interrupt function COMPA anymore
    TIMSK0 &= ~_BV(OCIE0A);
    usingInterrupt = false;
  }
}
void setup()  
{ stringOne = String("Sonar 3");
//////////////////////////////////////////////////TB6612FNG////////////////////////////////////////////////////////////////////
  Serial.begin(115200);// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
  pinMode(STBY, OUTPUT);
  pinMode(PWMA, OUTPUT);
  pinMode(AIN1, OUTPUT);
  pinMode(AIN2, OUTPUT);
  pinMode(PWMB, OUTPUT);
  pinMode(BIN1, OUTPUT);
  pinMode(BIN2, OUTPUT);
  //stringOne = String("Sonar 3"); 
  // 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
  GPS.begin(9600);
  
  // uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
  // uncomment this line to turn on only the "minimum recommended" data
  //GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
  // For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
  // the parser doesn't care about other sentences at this time
  
  // Set the update rate
  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1 Hz update rate
  // For the parsing code to work nicely and have time to sort thru the data, and
  // print it out we don't suggest using anything higher than 1 Hz

  // Request updates on antenna status, comment out to keep quiet
  GPS.sendCommand(PGCMD_ANTENNA);

  // the nice thing about this code is you can have a timer0 interrupt go off
  // every 1 millisecond, and read data from the GPS for you. that makes the
  // loop code a heck of a lot easier!
  useInterrupt(true);

  delay(1000);
  // Ask for firmware version
  mySerial.println(PMTK_Q_RELEASE);
  }
//////////////////////////////////////////////////GPS END////////////////////////////////////////////////////////////////////// 
//////////////////////////////////////////////TB6612FNG END INTRUCTIONS///////////////////////////////////////////////////////
void move(int motor, int speed, int direction){
//Move specific motor at speed and direction
//motor: 0 for B 1 for A
//speed: 0 is off, and 255 is full speed
//direction: 0 clockwise, 1 counter-clockwise
  digitalWrite(STBY, HIGH); //disable standby
  boolean inPin1 = LOW;
  boolean inPin2 = HIGH;
if(direction == 1){
    inPin1 = HIGH;
    inPin2 = LOW;
  }
  if(motor == 1){
    digitalWrite(AIN1, inPin1);
    digitalWrite(AIN2, inPin2);
    analogWrite(PWMA, speed);
  }else{
    digitalWrite(BIN1, inPin1);
    digitalWrite(BIN2, inPin2);
    analogWrite(PWMB, speed);
  } 
}

void stop(){
//enable standby
digitalWrite(STBY, LOW);
}
////////////////////////////////////////////////////END TB1266FNG INSTRUCTIONS//////////////////////////////////////////////////////////////////////////////
uint32_t timer = millis();
void loop (){
           pinMode (pwPin1, INPUT);
     pulse = pulseIn(pwPin1, HIGH);
     inches = pulse / 147; //147uS per inch
        if (inches < 15){
          move (1, 150, 1);//motor 1, full left
          move (2, 0, 1);//motor 2, full left
          delay(100);
          stop();}
          //delay(250);
      Serial.print("Sonar 1,");
      Serial.print(inches); 
      Serial.print("in ");
      Serial.println();  
   pinMode (pwPin2, INPUT);       
   pulse = pulseIn(pwPin2, HIGH);
      inches = pulse / 147; //147uS per inch
      duration = pulseIn(pwPin2,HIGH);
      if (inches < 15) {
          move (1, 0, 1);//motor 1, full left
          move (2, 150, 1);//motor 2, full left
          delay(100);
          stop();}
          //delay(250);
      Serial.print("Sonar 2,");
      Serial.print(inches);
      Serial.print("in ");
      Serial.println();   
   pinMode (pwPin3, INPUT);
   pulse = pulseIn(pwPin3, HIGH);
      inches = pulse/147;  //147uS per inch
      if (inches < 15)
        { move (1, 150, 1);//motor 1, full left
          move (2, 150, 1);//motor 2, full left
          delay(100);
          stop();
          delay(2000);}
      Serial.print("Sonar 3,");
      Serial.print(inches);
      Serial.print("in");
      Serial.println(); 

 if (! usingInterrupt) {
    // read data from the GPS in the 'main loop'
 char c = GPS.read();
   // if you want to debug, this is a good time to do it!
   if (GPSECHO)
    if (c) Serial.print(c);
 }
   // if a sentence is received, we can check the checksum, parse it...
  if (GPS.newNMEAreceived()) {
     //Serial.println(GPS.lastNMEA());   // this also sets the newNMEAreceived() flag to false
     if (!GPS.parse(GPS.lastNMEA()))   // this also sets the newNMEAreceived() flag to false
      return;  // we can fail to parse a sentence in which case we should just wait for another
 }
//if millis() or timer wraps around, we'll just reset it
if(timer > millis()) 
    timer = millis();
// approximately every 2 seconds or so, print out the current stats
if (millis() - timer > 2000) { 
  timer = millis(); // reset the timer
    Serial.print("\nTime: ");
    Serial.print(GPS.hour, DEC); Serial.print(':');
    Serial.print(GPS.minute, DEC); Serial.print(':');
    Serial.print(GPS.seconds, DEC); Serial.print('.');
    Serial.println(GPS.milliseconds);
    Serial.print("Date: ");
    Serial.print(GPS.day, DEC); Serial.print('/');
    Serial.print(GPS.month, DEC); Serial.print("/20");
    Serial.println(GPS.year, DEC);
    Serial.print("Fix: "); Serial.print((int)GPS.fix);
    Serial.print(" quality: "); Serial.println((int)GPS.fixquality); 
  if (GPS.fix) {
        Serial.print("Location: ");
        Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
        Serial.print(", "); 
        Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
        Serial.print("Location (in degrees, works with Google Maps): ");
        Serial.print(GPS.latitudeDegrees, 4);
        Serial.print(", "); 
        Serial.println(GPS.longitudeDegrees, 4);
        Serial.print("Speed (knots): "); Serial.println(GPS.speed);
        Serial.print("Angle: "); Serial.println(GPS.angle);
        Serial.print("Altitude: "); Serial.println(GPS.altitude);
        Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
      } 
   }
}