First commit, working build.

lib/Adafruit-GPS-Library/examples/locus_erase/locus_erase.pde

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+// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
+//
+// This code erases the LOCUS built-in datalogger storage
+//
+// 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
+
+#include <Adafruit_GPS.h>
+#if ARDUINO >= 100
+ #include <SoftwareSerial.h>
+#else
+  // Older Arduino IDE requires NewSoftSerial, download from:
+  // http://arduiniana.org/libraries/newsoftserial/
+// #include <NewSoftwareSerial.h>
+ // DO NOT install NewSoftSerial if using Arduino 1.0 or later!
+#endif
+
+// 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 3
+//   Connect the GPS RX (receive) pin to Digital 2
+// If using hardware serial (e.g. Arduino Mega):
+//   Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
+//   Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3
+
+// If using software serial, keep these lines enabled
+// (you can change the pin numbers to match your wiring):
+#if ARDUINO >= 100
+  SoftwareSerial mySerial(3, 2);
+#else
+  NewSoftSerial mySerial(3, 2);
+#endif
+Adafruit_GPS GPS(&mySerial);
+// If using hardware serial (e.g. Arduino Mega), comment
+// out the above six lines and enable this line instead:
+//Adafruit_GPS GPS(&Serial1);
+
+
+// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
+// Set to 'true' if you want to debug and listen to the raw GPS sentences
+#define GPSECHO  false
+
+// this keeps track of whether we're using the interrupt
+// off by default!
+boolean usingInterrupt = false;
+void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
+
+void setup()  
+{    
+  // connect at 115200 so we can read the GPS fast enuf and
+  // also spit it out
+  Serial.begin(115200);
+  Serial.println("Adafruit GPS erase FLASH!");
+
+  // 9600 NMEA is the default baud rate for MTK
+  GPS.begin(9600);
+  
+  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_OFF);
+
+  // the nice thing about this code is you can have a timer0 interrupt go off
+  // every 1 millisecond, and read data from the GPS for you. that makes the
+  // loop code a heck of a lot easier!
+  useInterrupt(true);
+
+  Serial.println("This code will ERASE the data log stored in the FLASH - Permanently!");
+  Serial.print("Are you sure you want to do this? [Y/N]: ");
+  while (Serial.read() != 'Y')   delay(10);
+  Serial.println("\nERASING! UNPLUG YOUR ARDUINO WITHIN 5 SECONDS IF YOU DIDNT MEAN TO!");
+  delay(5000);
+  GPS.sendCommand(PMTK_LOCUS_ERASE_FLASH);
+  Serial.println("Erased");
+}
+
+
+
+void loop()                     // run over and over again
+{
+  // If using hardware serial (e.g. Arduino Mega), change this to Serial1, etc.
+  if (mySerial.available()) {
+    char c = mySerial.read();
+      if (c) UDR0 = c;  
+  }
+}
+
+/******************************************************************/
+// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
+SIGNAL(TIMER0_COMPA_vect) {
+  char c = GPS.read();
+  // if you want to debug, this is a good time to do it!
+  if (GPSECHO)
+    if (c) UDR0 = c;  
+    // writing direct to UDR0 is much much faster than Serial.print 
+    // but only one character can be written at a time. 
+    
+}
+
+void useInterrupt(boolean v) {
+  if (v) {
+    // Timer0 is already used for millis() - we'll just interrupt somewhere
+    // in the middle and call the "Compare A" function above
+    OCR0A = 0xAF;
+    TIMSK0 |= _BV(OCIE0A);
+    usingInterrupt = true;
+  } else {
+    // do not call the interrupt function COMPA anymore
+    TIMSK0 &= ~_BV(OCIE0A);
+    usingInterrupt = false;
+  }
+}
+
+