From 461d908af89bda30b073a4da568e89fc4a79ee23 Mon Sep 17 00:00:00 2001
From: ladyada <limor@ladyada.net>
Date: Mon, 30 Nov 2015 00:01:35 -0500
Subject: [PATCH] checksum code really workin now fixes
 https://github.com/adafruit/Adafruit-GPS-Library/issues/40

---
 Adafruit_GPS.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Adafruit_GPS.cpp b/Adafruit_GPS.cpp
index 0c655a3..2620a13 100755
--- a/Adafruit_GPS.cpp
+++ b/Adafruit_GPS.cpp
@@ -39,12 +39,12 @@ boolean Adafruit_GPS::parse(char *nmea) {
     sum += parseHex(nmea[strlen(nmea)-2]);
     
     // check checksum 
-    for (uint8_t i=1; i < (strlen(nmea)-4); i++) {
+    for (uint8_t i=2; i < (strlen(nmea)-4); i++) {
       sum ^= nmea[i];
     }
     if (sum != 0) {
       // bad checksum :(
-      //return false;
+      return false;
     }
   }
   int32_t degree;