diff --git a/rrlp-ephemeris/ubx.h b/rrlp-ephemeris/ubx.h
new file mode 100644
index 0000000..8264386
--- /dev/null
+++ b/rrlp-ephemeris/ubx.h
@@ -0,0 +1,232 @@
+/*
+ * ubx.h
+ *
+ * Header for UBX related stuff
+ *
+ *
+ * Copyright (C) 2009  Sylvain Munaut <tnt@246tNt.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __UBX_H__
+#define __UBX_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/* Constants used in UBX */
+
+	/* Sync bytes (two first bytes of each message) */
+#define UBX_SYNC0		0xb5
+#define UBX_SYNC1		0x62
+
+	/* UBX messages classes */
+#define UBX_CLASS_NAV		0x01
+#define UBX_CLASS_RXM		0x02
+#define UBX_CLASS_INF		0x04
+#define UBX_CLASS_ACK		0x05
+#define UBX_CLASS_CFG		0x06
+#define UBX_CLASS_UPD		0x09
+#define UBX_CLASS_MON		0x0a
+#define UBX_CLASS_AID		0x0b
+#define UBX_CLASS_TIM		0x0d
+
+	/* UBX messages type ID (by class) */
+#define UBX_NAV_POSECEF		0x01
+#define UBX_NAV_POSLLH		0x02
+#define UBX_NAV_STATUS		0x03
+#define UBX_NAV_DOP		0x04
+#define UBX_NAV_SOL		0x06
+#define UBX_NAV_POSUTM		0x08
+#define UBX_NAV_VELECEF		0x11
+#define UBX_NAV_VELNED		0x12
+#define UBX_NAV_TIMEGPS		0x20
+#define UBX_NAV_TIMEUTC		0x21
+#define UBX_NAV_CLOCK		0x22
+#define UBX_NAV_SVINFO		0x30
+#define UBX_NAV_DGPS		0x31
+#define UBX_NAV_SBAS		0x32
+#define UBX_NAV_EKFSTATUS	0x40
+
+#define UBX_RXM_RAW		0x10
+#define UBX_RXM_SFRB		0x11
+#define UBX_RXM_SVSI		0x20
+#define UBX_RXM_SVSI_GPS	0x20
+#define UBX_RXM_ALM		0x30
+#define UBX_RXM_EPH		0x31
+#define UBX_RXM_POSREQ		0x40
+
+#define UBX_INF_ERROR		0x00
+#define UBX_INF_WARNING		0x01
+#define UBX_INF_NOTICE		0x02
+#define UBX_INF_TEST		0x03
+#define UBX_INF_DEBUG		0x04
+#define UBX_INF_USER		0x07
+
+#define UBX_ACK_NAK		0x00
+#define UBX_ACK_ACK		0x01
+
+#define UBX_CFG_PRT		0x00
+#define UBX_CFG_USB		0x1b
+#define UBX_CFG_MSG		0x01
+#define UBX_CFG_NMEA		0x17
+#define UBX_CFG_RATE		0x08
+#define UBX_CFG_CFG		0x09
+#define UBX_CFG_TP		0x07
+#define UBX_CFG_NAV2		0x1a
+#define UBX_CFG_DAT		0x06
+#define UBX_CFG_INF		0x02
+#define UBX_CFG_RST		0x04
+#define UBX_CFG_RXM		0x11
+#define UBX_CFG_ANT		0x13
+#define UBX_CFG_FXN		0x0e
+#define UBX_CFG_SBAS		0x16
+#define UBX_CFG_LIC		0x80
+#define UBX_CFG_TM		0x10
+#define UBX_CFG_TM2		0x19
+#define UBX_CFG_TMODE		0x1d
+#define UBX_CFG_EKF		0x12
+
+#define UBX_UPD_DOWNL		0x01
+#define UBX_UPD_UPLOAD		0x02
+#define UBX_UPD_EXEC		0x03
+#define UBX_UPD_MEMCPY		0x04
+
+#define UBX_MON_SCHD		0x01
+#define UBX_MON_IO		0x02
+#define UBX_MON_IPC		0x03
+#define UBX_MON_VER		0x04
+#define UBX_MON_EXCEPT		0x05
+#define UBX_MON_MSGPP		0x06
+#define UBX_MON_RXBUF		0x07
+#define UBX_MON_TXBUF		0x08
+#define UBX_MON_HW		0x09
+#define UBX_MON_USB		0x0a
+
+#define UBX_AID_REQ		0x00
+#define UBX_AID_INI		0x01
+#define UBX_AID_HUI		0x02
+#define UBX_AID_DATA		0x10
+#define UBX_AID_ALM		0x30
+#define UBX_AID_EPH		0x31
+
+#define UBX_TIM_TP		0x01
+#define UBX_TIM_TM		0x02
+#define UBX_TIM_TM2		0x03
+#define UBX_TIM_SVIN		0x04
+
+
+/* Header */
+struct ubx_hdr {
+        uint8_t  sync[2];
+        uint8_t  msg_class;
+        uint8_t  msg_id;
+        uint16_t payload_len;
+} __attribute__((packed));
+
+
+/* Payload formats (some of them) */
+struct ubx_nav_posllh {
+	uint32_t itow;
+	int32_t  lon;	/* scaling 1e-7 */
+	int32_t  lat;	/* scaling 1e-7 */
+	int32_t  height;/* mm */
+	int32_t  hsl;	/* mm */
+	uint32_t hacc;	/* mm */
+	uint32_t vacc;	/* mm */
+} __attribute__((packed));
+
+struct ubx_aid_ini {
+	int32_t  x;
+	int32_t  y;
+	int32_t  z;
+	uint32_t posacc;
+	uint16_t tm_cfg;
+	uint16_t wn;
+	uint32_t tow;
+	int32_t  tow_ns;
+	uint32_t tacc_ms;
+	uint32_t tacc_ns;
+	int32_t  clkd;
+	uint32_t clkdacc;
+	uint32_t flags;
+} __attribute__((packed));
+
+struct ubx_aid_hui {
+	uint32_t health;
+	double   utc_a1;
+	double   utc_a0;
+	int32_t  utc_tot;
+	int16_t  utc_wnt;
+	int16_t  utc_ls;
+	int16_t  utc_wnf;
+	int16_t  utc_dn;
+	int16_t  utc_lsf;
+	int16_t  utc_spare;
+	float    klob_a0;
+	float    klob_a1;
+	float    klob_a2;
+	float    klob_a3;
+	float    klob_b0;
+	float    klob_b1;
+	float    klob_b2;
+	float    klob_b3;
+	uint32_t flags;
+} __attribute__((packed));
+
+struct ubx_aid_alm {
+	uint32_t sv_id;
+	uint32_t gps_week;
+	uint32_t alm_words[8];	/* Present only if 'gps_week' != 0 */
+} __attribute__((packed));
+
+struct ubx_aid_eph {
+	uint32_t sv_id;
+	uint32_t present;
+	uint32_t eph_words[24];	/* Present only if 'present' != 0 */
+} __attribute__((packed));
+
+
+/* Message handler */
+typedef void (*ubx_msg_handler_t)(
+	struct ubx_hdr *hdr, void *payload, int payload_len, void *userdata);
+
+struct ubx_dispatch_entry {
+	uint8_t msg_class;
+	uint8_t msg_id;
+	ubx_msg_handler_t handler;
+};
+
+#define UBX_DISPATCH(kls,id,hdl) {		\
+	.msg_class = UBX_CLASS_ ## kls ,	\
+	.msg_id = UBX_ ## kls ## _ ## id,	\
+	.handler = (hdl),			\
+}
+
+
+/* Methods */
+int ubx_msg_dispatch(struct ubx_dispatch_entry *dt,
+                     void *msg, int len, void *userdata);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __UBX_H__ */
+