TinyGPS library and GPS accuracy - decimal place truncation

Hi all,

have been using the tiny gps library and a venus GPS (http://www.sparkfun.com/products/11058) . Got it reading the GPS today and parsing the data using the library. Thing is the data comes from the GPS latitude and longitude minutes to 6 decimal places but the library only returns 5.

The 6th dp wanders a little but is still useful. There is plenty of room in the long int that stores the lat and long - full data for each of latitude and longituse will be 8 numbers, i.e. 2 numbers for minutes and 6 decimal places.

No idea why you would truncate data like this!

Have looked in the library and being cpp is a little opaque for me who only generally uses C and matlab. It looks like the offending function is:

unsigned long TinyGPS::parse_degrees()
  char *p;
  unsigned long left = gpsatol(_term);
  unsigned long tenk_minutes = (left % 100UL) * 10000UL;
  for (p=_term; gpsisdigit(*p); ++p);
  if (*p == '.')
    unsigned long mult = 1000;
    while (gpsisdigit(*++p))
      tenk_minutes += mult * (*p - '0');
      mult /= 10;
  return (left / 100) * 100000 + tenk_minutes / 6;

Any ideas how to tweak this so that i can retain the last dp that i can see is there on the raw stream?

The basic code to get the data is below.

btw there is a method to get the data out as a float but it is still truncated.

#include <TinyGPS.h>
#include <NewSoftSerial.h>

TinyGPS gps;
#define RXPIN 10
#define TXPIN 11
NewSoftSerial nss(RXPIN, TXPIN);

long lat, lon;
unsigned long age, time, date, speed, course;
unsigned long chars;
unsigned short sentences, failed_checksum;
bool newdata;

void setup() 
  Serial.begin(57600); // Radio serial
    // set the data rate for the SoftwareSerial port
  // prints title with ending line break 

void loop()
  while (nss.available())
    int c = nss.read();
  gps.get_position(&lat, &lon, NULL); 
    Serial.print("Latitude:  "); Serial.println(lat);
    Serial.print("Longitude:  "); Serial.println(lon);


static bool feedgps()
  while (nss.available())
    if (gps.encode(nss.read()))
      return true;
  return false;

Found the answer in the reply of 'Michael Shimniok (Bot Thoughts)' on the Arduiniana TinyGPS page which referrers to a fix at TinyGPS::parse_degrees() - Pastebin.com.