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diff --git a/src/fsm/gps.h b/src/fsm/gps.h
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Matthias P. Braendli
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#ifndef __GPS_H_
+#define __GPS_H_
+
+/* Setup GPS receiver over I2C and parse time */
+
+/* I2C connections:
+ * SCL on PB6
+ * SDA on PB9
+ */
+
+#define GPS_I2C_ADDR 0x42 // I2C address of GPS receiver
+
+#include "ubx.h"
+
+// Setup communication and GPS receiver
+void gps_init();
+
+// Return 1 of the GPS is receiving time
+int gps_locked();
+
+// Get current time from GPS
+ubx_nav_timeutc_t* gps_utctime();
+
+#endif // __GPS_H_
+