gps.encode() always returning false

i've arduino duemilanove , radix up501 gps module.
i've connected tx of module pin 10 of arduino. vcc of module 5v of arduino , ground of module ground of arduino.

this code :

quote

#include <tinygps.h>

/*
circuit:
* rx digital pin 10 (connect tx of other device)
* tx digital pin 11 (connect rx of other device)  */

#include <softwareserial.h>

softwareserial myserial(10, 11); // rx, tx
tinygps gps;

unsigned long fix_age;
long lat, lon;
int c;

void setup()  
{
 // open serial communications , wait port open:
 serial.begin(4800);
 while (!serial) {
   ; // wait serial port connect. needed leonardo only
 }


 serial.println("goodnight moon!");

 // set data rate softwareserial port
 myserial.begin(4800);
}

void loop() // run on , over
{
 if (myserial.available())
   c = myserial.read();
   if(gps.encode(c)){
     serial.println("inside if condition");
     gps.get_position(&lat, &lon, &fix_age);
     serial.print("lat :");
     serial.print(lat);
   }
}

the problem gps.encode() returning false.
what problem. gps module derped ??

is gps connected myserial instance? if so, purpose of code:

code: [select]

  myserial.println("hello, world?");
are expecting gps reply that?

are sure myserial.available() ever returns non-zero value? if so, myserial.read() return?

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