gps 4.1 crono

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include "SSD1306Ascii.h"
#include "SSD1306AsciiWire.h"
#include <NMEAGPS.h>
#include <NeoSWSerial.h>
#define I2C_ADDRESS 0x3C
#define RST_PIN -1
#define MAX_CHARS 24
#define RX_pin 5
#define TX_pin 4
#define SHOW_INTERVAL 1
#define GPS_baud 9600
SSD1306AsciiWire oled;
NMEAGPS gps;
gps_fix fix;
float odo, Speed, alt, Dist, head, maxs = 0, Am = 0;
unsigned int  Sat = 0;
unsigned long tmp, var = 0;
int secondi, minuti = 0, ore = 0, fct = 2, fcl = 1;
NeoGPS::Location_t    lastLoc, base;
bool stScan = true, lastLocOK = false;
static NeoSWSerial gpsPort(RX_pin, TX_pin);
static constexpr int INITIAL_SHOW  = (2 * SHOW_INTERVAL) - 1;
int show          = INITIAL_SHOW;
const int   LED_PIN  = 3;
const float SPEED_LIMIT = 0.1; // speed limit value
void disp(int c, int r)
{
  oled.clear();
  oled.setCursor(c, r);
}
void setup() {

  pinMode (LED_PIN, OUTPUT);
  Serial.begin(9600);
  gpsPort.begin(GPS_baud);
  Wire.begin();
  oled.begin(&SH1106_128x64, I2C_ADDRESS);
  oled.setFont(ZevvPeep8x16);
  oled.clear();

  const int cs_sd = 2;
  if (!SD.begin (cs_sd)) {
    oled.clear();
    disp(65, 2);
    oled.print("SD");//if you read this mean SD is not present
    delay(10000);
    oled.clear();
    return;
  }

  File data = SD.open("L.csv", FILE_WRITE);
  data.println("");
  data.println("Da  Hr  Tm  La  Lo  At  Am  Km  Di  Ve  He  Sa" );
  data.close();
}
void loop() {
  tmp = (millis() / 1000);
  secondi = tmp - (var * 10) + fct;
  if (secondi > 60) {
    secondi = secondi - 60;
  }
  if (secondi == 60) {
    minuti = minuti + 1;
    var = var + 6;
  }
  if (((minuti == 10) || (minuti == 20) || (minuti == 30) || (minuti == 40) || (minuti == 50) || (minuti == 60)) && (secondi == 1))   {
    fct = fct + fcl;
  }
  if (minuti >= 60) {
    minuti = 0;
    ore = ore + 1;
  }
  if (ore >= 24) {
    ore = 0;
  }
  if (gps.available( gpsPort )) {
    gps_fix fix = gps.read();
    show = (show + 1) % SHOW_INTERVAL;
    if (fix.valid.speed && (fix.speed_kph() > SPEED_LIMIT)) {
      digitalWrite( LED_PIN, HIGH );
    } else {
      digitalWrite( LED_PIN, LOW );
    }
    if (fix.valid.location) {
      if (lastLocOK) {
        odo += fix.location.DistanceKm( lastLoc );
        Speed = fix.speed_kph();
      }
      lastLoc   = fix.location;
      lastLocOK = true;
      if (stScan) {
        stScan = false;
        base   = fix.location;
      } else {
        Dist = ( fix.location.DistanceKm( base ) );
      }
    }
    if ( Speed > maxs)          maxs = Speed;
    if (fix.valid.heading )     head = fix.heading() ;
    if (fix.valid.satellites )  Sat = fix.satellites ;
    if (fix.valid.altitude)     alt = fix.altitude();
    if ( alt > Am)              Am = alt;
    if (show == 0) {
      char displayBufffer[MAX_CHARS];
      oled.setCursor(0, 0);
      snprintf(displayBufffer, MAX_CHARS, "Km:%2d.%1d",  (int)odo, (int)(odo * 100) % 100);
      oled.println(displayBufffer);
      oled.setCursor(65, 0);
      snprintf(displayBufffer, MAX_CHARS, "Di:%2d.%1d",  (int)Dist, (int)(Dist * 100) % 100);
      oled.println(displayBufffer);
      snprintf(displayBufffer, MAX_CHARS, "Ve:%2d.%1d", (int)Speed, (int)(Speed * 10) % 10);
      oled.println(displayBufffer);
      oled.setCursor(65, 2);
      snprintf(displayBufffer, MAX_CHARS, "Vm:%2d.%1d", (int)maxs, (int)(maxs * 10) % 10);
      oled.println(displayBufffer);
      snprintf(displayBufffer, MAX_CHARS, "Al:%2d.%1d", (int)alt, (int)(alt * 100) % 100);
      oled.println(displayBufffer);
      oled.setCursor(65, 4);
      snprintf(displayBufffer, MAX_CHARS, "Am:%2d.%1d", (int)Am, (int)(Am * 100) % 100);
      oled.println(displayBufffer);
      snprintf(displayBufffer, MAX_CHARS, "%d:%d:%d ", (int)ore, (int)minuti, (int)secondi);
      oled.println(displayBufffer);
      oled.setCursor(65, 6);
      snprintf(displayBufffer, MAX_CHARS, "He:%2d.%1d", (int)head, (int)(head * 100) % 100);
      oled.println(displayBufffer);
    }
    File data = SD.open("L.csv", FILE_WRITE);
    data.print(fix.dateTime.hours + 2);
    data.print(":");
    data.print(fix.dateTime.minutes);
    data.print("  ");
    data.print(fix.dateTime.date);
    data.print("/");
    data.print(fix.dateTime.month);
    data.print("  ");
    data.print(ore);
    data.print(":");
    data.print(minuti);
    data.print(":");
    data.print(secondi);
    data.print("  ");
    data.print(fix.latitude(), 6);
    data.print("  ");
    data.print(fix.longitude(), 6);
    data.print("  ");
    data.print(alt);
    data.print("  ");
    data.print(Am);
    data.print("  ");
    data.print(odo);
    data.print("  ");
    data.print(Dist);
    data.print("  ");
    data.print(Speed);
    data.print("  ");
    data.print(head);
    data.print("  ");
    data.print(Sat);
    data.println();
    data.close();
  }
}