DATA FORMATS			MEANING
-----------------------------------------------------------------------------------

C			->	data field contains a character

C(m=str1)(n=str2)...	->	data field contains a character
				=m means str1
				=n means str2 ...
				Don't use ',' '(' or ')' in strings str1 and str2 !

CD			->      character is a direction indicator
				N north
				S south
				W west
				E east
				L left
				R right

CC			->      communications mode
				d F3E G3E SimplexTelephone
				e F3E G3E DuplexTelephone
				m J3E Telephone
				o H3E Telephone
				q F1B J2B FEC NBDP TelexTeleprinter
				s F1B J2B ARQ NBDP TelexTeleprinter
				w F1B J2B Receive Only Teleprinter DSC
				x A1A Morse Tape Recorder
				{ A1A Morse Tape Recorder
				| F1C F2C F3C Fax Machine

CR			-> 	Reference indicator
				B Bottom Tracking Log
				M Manually Entered
				W Water Referenced
				R Radar Tracking Of Fixed Target
				P Positioning System Ground Reference

CT			->	Transducer indicator
				A Angular Displacement Transducer
				D Linear Displacement Transducer
				C Temperature Transducer
				F Frequency Transducer
				N Force Transducer
				P Pressure Transducer
				R FlowRate Transducer
				T Tachometer Transducer
				H Humidity Transducer
				V Volume Transducer

CL			->	Loran time difference indicator
				B Loran Blink Warning
				C Loran Cycle Warning
				S Loran SNR Warning
				A Loran Valid

B			->	data field contains a boolean value (character)
				=A -> true
				=V -> false
				same as C(A=true)(V=false)

B(str1)(str2) 	 	->	=A -> str1
				=V -> str2
				same as C(A=str1)(V=str2)

S			->	String
S(x)			->	undefined length, but expand
				with leading spaces to length x

X			->	floating point number
X(x)			->	floating point number,
				expand string representation with
				leading spaces to length x
X(0x)			->	floating point number,
				expand string representation with
				leading '0's to length x

H(x)			-> 	hexvalue
				expand string representation with
				leading '0's to length x

E			->	Earth datum index (Garmin propietary)

T			->	time (hhmmss or hhmmss.sss)
D			->	date (ddmmyy)

A			->	latitude (includes following data field N/S)
O			->	longitude (includes following data field E/W)

N			->	pair of data fields;
				the 1st contains a total message number
				and the 2nd contains the number of the received message

Mm			->	bearing in degrees (magnetic)
Mt			->	bearing in degrees (true)
MM,MT			->	like Mm and Mt, but the next field will be ignored.
				(This contains the redundant character M or T.)

-			->	ignore data field


Only for X-flags you can specify the units:

  Adding [u=c] means the units c of the units-group u.
  Following characters are allowed for u:

	Symbol	Measurement	Internal units of stored datas

	D	Distance	m
	V	Velocity	m/s
	T	Time		s
	R	Direction	°
	K	Temperature	°C
	U	Revolution	RPM
	P	Pressure	bar
	S	Signal		dB
	F	Frequency	Hz
	v	Volume		l
	H	Humidity	%

  Following characters are allowed for c:
   (Symbols like in the NMEA protocol;
   only (*)-units are not defined in NMEA standard)

	B	Bars; Degrees/Minute (*) ; Decibel (*)
	C	Celcius
	D	Degrees
	F	Fathoms
	f	Feets
	H	Hertz
	h	Hours
	I	Inches; Inches of Mercury (*)
	i	Microseconds (*)
	j	Microseconds/10 (*)
	K	Kilometers; Kilometers/Hour; Kilohertz (*)
	k	Kilograms (**)
	l	Liters; Liters/Second (**)
	M	Meters; Meters/Second; Cubic Meters
	m	Minutes
	N	Nautical Miles; Knots; Newtons (**)
	P	Percent (***)
	S	Statute Miles/Hour
	s	Seconds
	R	Revolutions/Minute (*)

   (**)  Not assigned to any unit group; not used in program
   (***) Allowed in all unit groups


Additional in all cases:
 c=#	: read units from next field
 c=x	: read units from data field number x

If you use c=x and the data field x will not be ignored automatically by a preceeding
field with c=#, you have to declare this data field as an ignorable parse field
(symbol '-').



REPEATING GROUP OF PARSE FIELDS
-------------------------------

You can add a '*' at the end of a parse field descriptor. This means: here
starts a group of parse fields, which describes a group of data fields, they
can occur repeatedly in the sentence. The group reaches until the end of
the descriptor list. So, after such a list no other parse field outside of
the list is allowed. Example:

 $--SFI,x.x,x.x,xxxxxx,c .......... xxxxxx,c*hh<CR><LF>

  1.) Total Number Of Messages
  2.) Message Number
  3.) Frequency 1
  4.) Mode 1
  x.) Checksum

  Parse fields:		"Message number,N"
			"Frequency,X*"
			"Mode,C"


(c) Torsten Baumbach, 05.08.1999