GPS Km Counter

[BrianDen]

I am trying to make a GPS KM counter.
Any thoughts on this code?

#include <TinyGPS++.h>
#include <EEPROM.h>

TinyGPSPlus gps;

double PreviousLat;            // Previos Latitude
double PreviousLng;            // Previous Longitude
double DistanceBetween;        // Distance between current and last saved position
double Km = 0;                 // Km
double KmCounter = 0;          // Total vehicule km's
int KmStoreLocation;           // EEPRROM Byte where km's are stored
bool PreviousPosition = false; // No previous position has been stored, change to true after storing a position

void GPSKMCounter(){
  if (gps.location.isValid()) {
    if (PreviousPosition == false) {                                                                                      // Store start position
      PreviousLat = gps.location.lat();
      PreviousLng = gps.location.lng();
      PreviousPosition = true;
      KmCounter = EEPROM.read(50);                                                                                        // Read current km's stored
      if (KmCounter >= 100000) {                                                                                          // If reached 100.000KM move to next byte, EEPROM 100.000 write cycles
        KmCounter = EEPROM.read(51);
      }
      if (KmCounter >= 200000) {                                                                                          // // If reached 200.000KM move to next byte, EEPROM 100.000 write cycles
        KmCounter = EEPROM.read(52);
      }
    } else {                                                                                                              // PreviousPosition == true
      if(gps.distanceBetween(gps.location.lat(), gps.location.lng(), PreviousLat, PreviousLng) > 100) {                   // If traveled more then 100 meter
        Km += (gps.distanceBetween(gps.location.lat(), gps.location.lng(), PreviousLat, PreviousLng)) / 1000;             // KM travelled
        if (Km >= 1) {
          KmCounter += Km;
          if (KmCounter < 100000) {
            EEPROM.write(50, KmCounter);
          } else if (KmCounter >= 100000 && KmCounter < 200000) {
            EEPROM.write(51, KmCounter);
          } else if (KmCounter >= 200000) {
            EEPROM.write(52, KmCounter);
          }
          Km = 0;                                                                                                         // Reset Km to 0
        }
      }
    }
  }
}