Divided code in different files.

Improvement? Unsure :)
Promise for a better future: yeah!

Display.ino

@@ -0,0 +1,97 @@
+void disMinute () {
+    // +/- 125 msec
+    fona.getBattPercent(&battpercent);
+    Serial.print(F("Batterij:"));
+    Serial.println(battpercent);
+    display.setCursor(18,57);
+    display.print(battpercent);
+    display.print("%");
+    lastMillisFona = millis(); // reset the timer    
+    byte RSSI = fona.getRSSI();
+
+    uint8_t r = map(fona.getRSSI(), 0, 31, 1, 5);
+    display.setCursor(48,57);
+    display.print(r);
+    lastMillisFona = millis(); // reset the timer    
+
+    if (GPS.fix && GPS.HDOP < 5 && GPS.HDOP != 0) {
+      current_location.set(GPS);
+      Serial.print(F("Location: "));
+      Serial.print(current_location.latitude, 6);
+      Serial.print(F(", "));
+      Serial.print(current_location.longitude, 6);
+      Serial.print(F(", "));
+      Serial.println(current_location.altitude, 2);
+      Serial.print(F("HDOP: ")); Serial.println(GPS.HDOP);
+      sendLocation(battpercent);
+    }
+}
+
+void dis10S() {
+  timer = millis(); // reset the timer
+  char time[5];
+  // ToDo: timezone implementation
+  sprintf(time, "%2d:%02d", GPS.hour+1, GPS.minute);
+  display.setCursor(65,57);
+  display.print(time);
+  /*
+  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) {
+    display.drawChar(91,16,'G',WHITE,BLACK,1);
+    /*display.print(GPS.latitude, 4); display.print(':');
+    display.println(GPS.longitude, 4);*/
+    /*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("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);*/      
+  }
+  else {
+    display.drawChar(91,16,'g',WHITE,BLACK,1);
+  }
+}
+
+void disSecond() {
+  int heading = orientation.heading + 180;
+  display.setCursor(0,57);
+  if (heading < 0) {
+    display.print("??");
+    display.print(heading);                
+  } else if (heading < 23) {
+    display.print("W ");
+  } else if (heading < 68) {
+    display.print("ZW");      
+  } else if (heading < 113) { 
+    display.print("Z ");
+  } else if (heading < 158) {
+    display.print("ZO");      
+  } else if (heading < 203) {
+    display.print("O ");
+  } else if (heading < 248) {
+    display.print("NO");      
+  } else if (heading < 293) {
+    display.print("N ");
+  } else if (heading < 338) {
+    display.print("NW");      
+  } else if (heading < 361) {
+    display.print("W ");
+  } else {
+    display.print("??");
+    display.print(heading);          
+  }
+  lastMillis9dof = millis();
+}