First commit, working build.

lib/Adafruit-GPS-Library/examples/leo_echo/leo_echo.ino

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+// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
+//
+// This code just echos whatever is coming from the GPS unit to the
+// serial monitor, handy for debugging!
+//
+// Tested and works great with the Adafruit Ultimate GPS module
+// using MTK33x9 chipset
+//    ------> http://www.adafruit.com/products/746
+// Pick one up today at the Adafruit electronics shop 
+// and help support open source hardware & software! -ada
+
+//This code is intended for use with Arduino Leonardo and other ATmega32U4-based Arduinos
+
+#include <Adafruit_GPS.h>
+#include <SoftwareSerial.h>
+
+// Connect the GPS Power pin to 5V
+// Connect the GPS Ground pin to ground
+// If using software serial (sketch example default):
+//   Connect the GPS TX (transmit) pin to Digital 8
+//   Connect the GPS RX (receive) pin to Digital 7
+// If using hardware serial:
+//   Connect the GPS TX (transmit) pin to Arduino RX1 (Digital 0)
+//   Connect the GPS RX (receive) pin to matching TX1 (Digital 1)
+
+// If using software serial, keep these lines enabled
+// (you can change the pin numbers to match your wiring):
+SoftwareSerial mySerial(8, 7);
+
+// If using hardware serial, comment
+// out the above two lines and enable these two lines instead:
+//HardwareSerial mySerial = Serial1;
+
+#define PMTK_SET_NMEA_UPDATE_1HZ  "$PMTK220,1000*1F"
+#define PMTK_SET_NMEA_UPDATE_5HZ  "$PMTK220,200*2C"
+#define PMTK_SET_NMEA_UPDATE_10HZ "$PMTK220,100*2F"
+
+// turn on only the second sentence (GPRMC)
+#define PMTK_SET_NMEA_OUTPUT_RMCONLY "$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29"
+// turn on GPRMC and GGA
+#define PMTK_SET_NMEA_OUTPUT_RMCGGA "$PMTK314,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
+// turn on ALL THE DATA
+#define PMTK_SET_NMEA_OUTPUT_ALLDATA "$PMTK314,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
+// turn off output
+#define PMTK_SET_NMEA_OUTPUT_OFF "$PMTK314,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*28"
+
+#define PMTK_Q_RELEASE "$PMTK605*31"
+
+void setup() {
+  while (!Serial); // wait for leo to be ready
+
+  Serial.begin(57600); // this baud rate doesn't actually matter!
+  mySerial.begin(9600);
+  delay(2000);
+  Serial.println("Get version!");
+  mySerial.println(PMTK_Q_RELEASE);
+  
+  // you can send various commands to get it started
+  //mySerial.println(PMTK_SET_NMEA_OUTPUT_RMCGGA);
+  mySerial.println(PMTK_SET_NMEA_OUTPUT_ALLDATA);
+
+  mySerial.println(PMTK_SET_NMEA_UPDATE_1HZ);
+ }
+
+
+void loop() {
+  if (Serial.available()) {
+   char c = Serial.read();
+   Serial.write(c);
+   mySerial.write(c);
+  }
+  if (mySerial.available()) {
+    char c = mySerial.read();
+    Serial.write(c);
+  }
+}