float *t_oa,
	float *i_0,
	float *OMEGA_dot,
	float *sqrt_A,
	float *OMEGA_0,
	float *omega,
	float *M_0)
/* almanac data for specified satellite */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 39) return TRUE;
	*sv_prn = buf[0];
	*t_zc = bGetSingle (&buf[1]);
	*week_num = bGetShort (&buf[5]);
	*eccentricity = bGetSingle (&buf[7]);
	*t_oa = bGetSingle (&buf[11]);
	*i_0 = bGetSingle (&buf[15]);
	*OMEGA_dot = bGetSingle (&buf[19]);
	*sqrt_A = bGetSingle (&buf[23]);
	*OMEGA_0 = bGetSingle (&buf[27]);
	*omega = bGetSingle (&buf[31]);
	*M_0 = bGetSingle (&buf[35]);
	return FALSE;
}

short rpt_0x41 (TSIPPKT *rpt,
	float *time_of_week,
	float *UTC_offset,
	short *week_num)
/* GPS time */
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 10) return TRUE;
	*time_of_week = bGetSingle (buf);
	*week_num = bGetShort (&buf[4]);
	*UTC_offset = bGetSingle (&buf[6]);
	return FALSE;
}

short rpt_0x42 (TSIPPKT *rpt,
	float pos_ECEF[3],
	float *time_of_fix)
/* position in ECEF, single precision */
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 16) return TRUE;
	pos_ECEF[0] = bGetSingle (buf);
	pos_ECEF[1]= bGetSingle (&buf[4]);
	pos_ECEF[2]= bGetSingle (&buf[8]);
	*time_of_fix = bGetSingle (&buf[12]);
	return FALSE;
}

short rpt_0x43 (TSIPPKT *rpt,
	float ECEF_vel[3],
	float *freq_offset,
	float *time_of_fix)
/* velocity in ECEF, single precision */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 20) return TRUE;
	ECEF_vel[0] = bGetSingle (buf);
	ECEF_vel[1] = bGetSingle (&buf[4]);
	ECEF_vel[2] = bGetSingle (&buf[8]);
	*freq_offset = bGetSingle (&buf[12]);
	*time_of_fix = bGetSingle (&buf[16]);
	return FALSE;
}

short rpt_0x45 (TSIPPKT *rpt,
	unsigned char *major_nav_version,
	unsigned char *minor_nav_version,
	unsigned char *nav_day,
	unsigned char *nav_month,
	unsigned char *nav_year,
	unsigned char *major_dsp_version,
	unsigned char *minor_dsp_version,
	unsigned char *dsp_day,
	unsigned char *dsp_month,
	unsigned char *dsp_year)
/* software versions */	
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 10) return TRUE;
	*major_nav_version = buf[0];
	*minor_nav_version = buf[1];
	*nav_day = buf[2];
	*nav_month = buf[3];
	*nav_year = buf[4];
	*major_dsp_version = buf[5];
	*minor_dsp_version = buf[6];
	*dsp_day = buf[7];
	*dsp_month = buf[8];
	*dsp_year = buf[9];
	return FALSE;
}

short rpt_0x46 (TSIPPKT *rpt,
	unsigned char *status_code,
	unsigned char *error_code)
/* receiver health and status */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 2) return TRUE;
	*status_code = buf[0];
	*error_code = buf[1];
	return FALSE;
}

short rpt_0x47 (TSIPPKT *rpt,
	unsigned char *nsvs, unsigned char *sv_prn,
	float *snr)
/* signal levels for all satellites tracked */
{
	short isv;
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 1 + 5*buf[0]) return TRUE;
	*nsvs = buf[0];
	for (isv = 0; isv < (*nsvs); isv++) {
		sv_prn[isv] = buf[5*isv + 1];
		snr[isv] = bGetSingle (&buf[5*isv + 2]);
	}
	return FALSE;
}

short rpt_0x48 (TSIPPKT *rpt,
	unsigned char *message)
/* GPS system message */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 22) return TRUE;
	memcpy (message, buf, 22);
	message[22] = 0;
	return FALSE;
}

short rpt_0x49 (TSIPPKT *rpt,
	unsigned char *sv_health)
/* health for all satellites from almanac health page */
{
	short i;
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 32) return TRUE;
	for (i = 0; i < 32; i++) sv_health [i]= buf[i];
	return FALSE;
}

short rpt_0x4A (TSIPPKT *rpt,
	float *lat,
	float *lon,
	float *alt,
	float *clock_bias,
	float *time_of_fix)
/* position in lat-lon-alt, single precision */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 20) return TRUE;
	*lat = bGetSingle (buf);
	*lon = bGetSingle (&buf[4]);
	*alt = bGetSingle (&buf[8]);
	*clock_bias = bGetSingle (&buf[12]);
	*time_of_fix = bGetSingle (&buf[16]);
	return FALSE;
}

short rpt_0x4A_2 (TSIPPKT *rpt,
	float *alt, float *dummy , unsigned char *alt_flag)
/* reference altitude parameters */
{
	unsigned char *buf;

	buf = rpt->buf;

	if (rpt->len != 9) return TRUE;
	*alt = bGetSingle (buf);
	*dummy = bGetSingle (&buf[4]);
	*alt_flag = buf[8];
	return FALSE;
}

short rpt_0x4B (TSIPPKT *rpt,
	unsigned char *machine_id,
	unsigned char *status_1,
	unsigned char *status_2)
/* machine ID code, status */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 3) return TRUE;
	*machine_id = buf[0];
	*status_1 = buf[1];
	*status_2 = buf[2];
	return FALSE;
}

short rpt_0x4C (TSIPPKT *rpt,
	unsigned char *dyn_code,
	float *el_mask,
	float *snr_mask,
	float *dop_mask,
	float *dop_switch)
/* operating parameters and masks */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 17) return TRUE;
	*dyn_code = buf[0];
	*el_mask = bGetSingle (&buf[1]);
	*snr_mask = bGetSingle (&buf[5]);
	*dop_mask = bGetSingle (&buf[9]);
	*dop_switch = bGetSingle (&buf[13]);
	return FALSE;
}

short rpt_0x4D (TSIPPKT *rpt,
	float *osc_offset)
/* oscillator offset */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 4) return TRUE;
	*osc_offset = bGetSingle (buf);
	return FALSE;
}

short rpt_0x4E (TSIPPKT *rpt,
	unsigned char *response)
/* yes/no response to command to set GPS time */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 1) return TRUE;
	*response = buf[0];
	return FALSE;
}

short rpt_0x4F (TSIPPKT *rpt,
	double *a0,
	float *a1,
	float *time_of_data,
	short *dt_ls,
	short *wn_t,
	short *wn_lsf,
	short *dn,
	short *dt_lsf)
/* UTC data */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 26) return TRUE;
	*a0 = bGetDouble (buf);
	*a1 = bGetSingle (&buf[8]);
	*dt_ls = bGetShort (&buf[12]);
	*time_of_data = bGetSingle (&buf[14]);
	*wn_t = bGetShort (&buf[18]);
	*wn_lsf = bGetShort (&buf[20]);
	*dn = bGetShort (&buf[22]);
	*dt_lsf = bGetShort (&buf[24]);
	return FALSE;
}

/**/
short rpt_0x54 (TSIPPKT *rpt,
	float *clock_bias,
   float *freq_offset,
   float *time_of_fix)
/* clock offset and frequency offset in 1-SV (0-D) mode */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 12) return TRUE;
	*clock_bias = bGetSingle (buf);
	*freq_offset = bGetSingle (&buf[4]);
	*time_of_fix = bGetSingle (&buf[8]);
	return FALSE;
}

short rpt_0x55 (TSIPPKT *rpt,
	unsigned char *pos_code,
	unsigned char *vel_code,
	unsigned char *time_code,
	unsigned char *aux_code)
/* I/O serial options */
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 4) return TRUE;
	*pos_code = buf[0];
	*vel_code = buf[1];
	*time_code = buf[2];
	*aux_code = buf[3];
	return FALSE;
}

short rpt_0x56 (TSIPPKT *rpt,
	float vel_ENU[3], float *freq_offset, float *time_of_fix)
/* velocity in east-north-up coordinates */	
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 20) return TRUE;
	/* east */
	vel_ENU[0] = bGetSingle (buf);
	/* north */
	vel_ENU[1] = bGetSingle (&buf[4]);
	/* up */
	vel_ENU[2] = bGetSingle (&buf[8]);
	*freq_offset = bGetSingle (&buf[12]);
	*time_of_fix = bGetSingle (&buf[16]);
	return FALSE;
}

short rpt_0x57 (TSIPPKT *rpt,
	unsigned char *source_code, unsigned char *diag_code,
	short *week_num,
	float *time_of_fix)
/* info about last computed fix */
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 8) return TRUE;
	*source_code = buf[0];
	*diag_code = buf[1];
	*time_of_fix = bGetSingle (&buf[2]);
	*week_num = bGetShort (&buf[6]);
	return FALSE;
}

short rpt_0x58 (TSIPPKT *rpt,
	unsigned char *op_code, unsigned char *data_type, unsigned char *sv_prn,
	unsigned char *data_length, unsigned char *data_packet)
/* GPS system data or acknowledgment of GPS system data load */
{
	unsigned char *buf, *buf4;
	short dl;
	ALM_INFO* alminfo;
	ION_INFO* ioninfo;
	UTC_INFO* utcinfo;
	NAV_INFO* navinfo;

	buf = rpt->buf;

	if (buf[0] == 2) {
		if (rpt->len < 4) return TRUE;
		if (rpt->len != 4+buf[3]) return TRUE;
	}
	else if (rpt->len != 3) {
		return TRUE;
	}
	*op_code = buf[0];
	*data_type = buf[1];
	*sv_prn = buf[2];
	if (*op_code == 2) {
		dl = buf[3];
		*data_length = (unsigned char)dl;
		buf4 = &buf[4];
		switch (*data_type) {
		case 2:
			/* Almanac */
			if (*data_length != sizeof (ALM_INFO)) return TRUE;
			alminfo = (ALM_INFO*)data_packet;
			alminfo->t_oa_raw  = buf4[0];
			alminfo->SV_health = buf4[1];
			alminfo->e         = bGetSingle(&buf4[2]);
			alminfo->t_oa      = bGetSingle(&buf4[6]);
			alminfo->i_0       = bGetSingle(&buf4[10]);
			alminfo->OMEGADOT  = bGetSingle(&buf4[14]);
			alminfo->sqrt_A    = bGetSingle(&buf4[18]);
			alminfo->OMEGA_0   = bGetSingle(&buf4[22]);
			alminfo->omega     = bGetSingle(&buf4[26]);
			alminfo->M_0       = bGetSingle(&buf4[30]);
			alminfo->a_f0      = bGetSingle(&buf4[34]);
			alminfo->a_f1      = bGetSingle(&buf4[38]);
			alminfo->Axis      = bGetSingle(&buf4[42]);
			alminfo->n         = bGetSingle(&buf4[46]);
			alminfo->OMEGA_n   = bGetSingle(&buf4[50]);
			alminfo->ODOT_n    = bGetSingle(&buf4[54]);
			alminfo->t_zc      = bGetSingle(&buf4[58]);
			alminfo->weeknum   = bGetShort(&buf4[62]);
			alminfo->wn_oa     = bGetShort(&buf4[64]);
			break;

		case 3:
			/* Almanac health page */
			if (*data_length != sizeof (ALH_PARMS) + 3) return TRUE;

			/* this record is returned raw */
			memcpy (data_packet, buf4, dl);
			break;

		case 4:
			/* Ionosphere */
			if (*data_length != sizeof (ION_INFO) + 8) return TRUE;
			ioninfo = (ION_INFO*)data_packet;
			ioninfo->alpha_0   = bGetSingle (&buf4[8]);
			ioninfo->alpha_1   = bGetSingle (&buf4[12]);
			ioninfo->alpha_2   = bGetSingle (&buf4[16]);
			ioninfo->alpha_3   = bGetSingle (&buf4[20]);
			ioninfo->beta_0    = bGetSingle (&buf4[24]);
			ioninfo->beta_1    = bGetSingle (&buf4[28]);
			ioninfo->beta_2    = bGetSingle (&buf4[32]);
			ioninfo->beta_3    = bGetSingle (&buf4[36]);
			break;

		case 5:
			/* UTC */
			if (*data_length != sizeof (UTC_INFO) + 13) return TRUE;
			utcinfo = (UTC_INFO*)data_packet;
			utcinfo->A_0       = bGetDouble (&buf4[13]);
			utcinfo->A_1       = bGetSingle (&buf4[21]);
			utcinfo->delta_t_LS = bGetShort (&buf4[25]);
			utcinfo->t_ot      = bGetSingle(&buf4[27]);
			utcinfo->WN_t      = bGetShort (&buf4[31]);
			utcinfo->WN_LSF    = bGetShort (&buf4[33]);
			utcinfo->DN        = bGetShort (&buf4[35]);
			utcinfo->delta_t_LSF = bGetShort (&buf4[37]);
			break;

		case 6:
			/* Ephemeris */
			if (*data_length != sizeof (NAV_INFO) - 1) return TRUE;

			navinfo = (NAV_INFO*)data_packet;

			navinfo->sv_number = buf4[0];
			navinfo->t_ephem = bGetSingle (&buf4[1]);
			navinfo->ephclk.weeknum = bGetShort (&buf4[5]);

			navinfo->ephclk.codeL2 = buf4[7];
			navinfo->ephclk.L2Pdata = buf4[8];
			navinfo->ephclk.SVacc_raw = buf4[9];
			navinfo->ephclk.SV_health = buf4[10];
			navinfo->ephclk.IODC = bGetShort (&buf4[11]);
			navinfo->ephclk.T_GD = bGetSingle (&buf4[13]);
			navinfo->ephclk.t_oc = bGetSingle (&buf4[17]);
			navinfo->ephclk.a_f2 = bGetSingle (&buf4[21]);
			navinfo->ephclk.a_f1 = bGetSingle (&buf4[25]);
			navinfo->ephclk.a_f0 = bGetSingle (&buf4[29]);
			navinfo->ephclk.SVacc = bGetSingle (&buf4[33]);

			navinfo->ephorb.IODE = buf4[37];
			navinfo->ephorb.fit_interval = buf4[38];
			navinfo->ephorb.C_rs = bGetSingle (&buf4[39]);
			navinfo->ephorb.delta_n = bGetSingle (&buf4[43]);
			navinfo->ephorb.M_0 = bGetDouble (&buf4[47]);
			navinfo->ephorb.C_uc = bGetSingle (&buf4[55]);
			navinfo->ephorb.e = bGetDouble (&buf4[59]);
			navinfo->ephorb.C_us = bGetSingle (&buf4[67]);
			navinfo->ephorb.sqrt_A = bGetDouble (&buf4[71]);
			navinfo->ephorb.t_oe = bGetSingle (&buf4[79]);
			navinfo->ephorb.C_ic = bGetSingle (&buf4[83]);
			navinfo->ephorb.OMEGA_0 = bGetDouble (&buf4[87]);
			navinfo->ephorb.C_is = bGetSingle (&buf4[95]);
			navinfo->ephorb.i_0 = bGetDouble (&buf4[99]);
			navinfo->ephorb.C_rc = bGetSingle (&buf4[107]);
			navinfo->ephorb.omega = bGetDouble (&buf4[111]);
			navinfo->ephorb.OMEGADOT=bGetSingle (&buf4[119]);
			navinfo->ephorb.IDOT = bGetSingle (&buf4[123]);
			navinfo->ephorb.Axis = bGetDouble (&buf4[127]);
			navinfo->ephorb.n = bGetDouble (&buf4[135]);
			navinfo->ephorb.r1me2 = bGetDouble (&buf4[143]);
			navinfo->ephorb.OMEGA_n=bGetDouble (&buf4[151]);
			navinfo->ephorb.ODOT_n = bGetDouble (&buf4[159]);
			break;
		}
	}
	return FALSE;
}

short rpt_0x59 (TSIPPKT *rpt,
	unsigned char *code_type,
	unsigned char status_code[32])
/* satellite enable/disable or health heed/ignore list */	
{
	short iprn;
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 33) return TRUE;
	*code_type = buf[0];
	for (iprn = 0; iprn < 32; iprn++)
		status_code[iprn] = buf[iprn + 1];
	return FALSE;
}

short rpt_0x5A (TSIPPKT *rpt,
	unsigned char *sv_prn,
	float *sample_length,
	float *signal_level,
	float *code_phase,
	float *Doppler,
	double *time_of_fix)
/* raw measurement data - code phase/Doppler */
{
	unsigned char *buf;
	buf = rpt->buf;

	if (rpt->len != 25) return TRUE;
	*sv_prn = buf[0];
	*sample_length = bGetSingle (&buf[1]);
	*signal_level = bGetSingle (&buf[5]);
	*code_phase = bGetSingle (&buf[9]);
	*Doppler = bGetSingle (&buf[13]);
	*time_of_fix = bGetDouble (&buf[17]);
	return FALSE;
}

short rpt_0x5B (TSIPPKT *rpt,
	unsigned char *sv_prn,
	unsigned char *sv_health,
	unsigned char *sv_iode,
	unsigned char *fit_interval_flag,
	float *time_of_collection,
	float *time_of_eph,
	float *sv_accy)
/* satellite ephorb status */	
{
	unsigned char *buf;
	buf = rpt->buf;
	
	if (rpt->len != 16) return TRUE;
	*sv_prn = buf[0];
	*time_of_collection = bGetSingle (&buf[1]);
	*sv_health = buf[5];
	*sv_iode = buf[6];
	*time_of_eph = bGetSingle (&buf[7]);
	*fit_interval_flag = buf[11];
	*sv_accy = bGetSingle (&buf[12]);
	return FALSE;
}

short rpt_0x5C (TSIPPKT *rpt,
	unsigned char *sv_prn,
	unsigned char *slot,