Odd error compiling GPS reader - 'explicit constructor'???

Hi All,

Im trying to send the data from a VKEL VK2828U7G5LF GPS module to the serial monitor. I have 'borrowed' the code attached from an 'instructable' online,

It wont compile. I get the error message below -

Arduino: 1.6.12 (Windows 7), Board: "Arduino/Genuino Uno"

In file included from C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:24:0,

from sketch\sketch_feb19c.ino.cpp:1:

C:\Users\HOMECO~1\AppData\Local\Temp\untitled1018368005.tmp\sketch_feb19c\sketch_feb19c.ino: In function 'String checkGPS()':

sketch_feb19c:55: error: converting to 'String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

return false;

^

exit status 1
converting to 'String' from initializer list would use explicit constructor 'String::String(int, unsigned char)'

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

This is an error beyond my experience! Can anyone tell me whats going wrong? and, ideally, how to fix it?

Code below-

#include <SoftwareSerial.h>
// GPS Setup
#define rxGPS 3
#define txGPS 5
SoftwareSerial serialGPS = SoftwareSerial(rxGPS, txGPS);
String stringGPS = "";

void setup() {
pinMode(rxGPS, INPUT);
pinMode(txGPS, OUTPUT);

Serial.begin(9600);
Serial.println("Started");

// GPS Setup
serialGPS.begin(4800);
digitalWrite(txGPS,HIGH);

// Cut first gibberish
while(serialGPS.available())
if (serialGPS.read() == '\r')
break;
}

void loop()
{
String s = checkGPS();
if(s && s.substring(0, 6) == "$GPGGA")
{
Serial.println(s);
}
}

// Check GPS and returns string if full line recorded, else false
String checkGPS()
{
if (serialGPS.available())
{
char c = serialGPS.read();
if (c != '\n' && c != '\r')
{
stringGPS = c;
}
else
{
if (stringGPS != "")
{
String tmp = stringGPS;
stringGPS = "";
return tmp;
}
}
}
return false;
}

ok, well, never mind!

I managed to get it to compile by changing the last line from return false to return ""

but the code wouldnt return anything from the GPS module, no matter what else i tried. So, I ditched that code and found some by someone else that actually specified the exact same GPS module. Sorry to the writer of that code, im afraid I cant give you credit as I closed the webpage!

This uses the TinyGPS library and is working very well

Edit - it was this chap here Problema con Modulo GPS vk2828u7g5lf con arduino uno - Hardware - Arduino Forum