Owner`s manual

Watson Industries, Inc. GGC-E101 Rev A 08/30/2013

7. “s” is a single character representing the Longitude direction. s = E for East Longitude, s =

W for West Longitude. This data is followed by a comma.

8. “zzz.zz” is a variable character string (minimum-4, maximum-6) representing the ground

speed. 0.00 to 999.99 knots. This data is followed by a comma.

9. “ttt.tt” is a variable character string (minimum-4, maximum-6) representing the Track made

good, referenced to true North.. 0.00 to 359.99 degrees. This data is followed by a comma.

10. “ddmmyy” is a six character string representing the UTC date of position fix. “dd” day,

”mm” month, “yy” year . This data is followed by a comma.

11. “ddd.d” is a variable character string (minimum-3, maximum-5) representing Magnetic

Variation 0.0 to 180.0 degrees. This data is followed by a comma.

12. “v” is a single character representing the Magnetic Variation direction. s = E for East

Longitude, s = W for West Longitude. This data is followed by a comma.

13. “i” is a single character representing the Mode Indicator. i = A for Autonomous, i = D for

Differential, i = E for Estimated.

14. “*cc” is a three character string representing an asterisk followed by a two digit

hexadecimal checksum.

15. <CR><LF> The string is terminated by a carriage return and Line Feed. There will then be

a short interval with no data transmission before the next string begins.

Example:

$GPRMC,175612.00,A,4451.84239,N,09128.00147,W,0.13,186.55,081210,0.8,W,D*39

$GPRMC  message Header

175612.00 Universal Time 21 Hrs 46 minutes 57.00 seconds

A  Status = valid data

4451.84239 latitude 44 deg 51.84043 minutes

N  North Lattitude

09128.00147 Longitude 91 deg 28.00263 minutes

W  West Longitude

0.13 Speed over ground 0.13 knots

Track Made Good 186.55 degrees  186.55

UTC Date of postion fix 08 December 2010  081210

Magnetic Variation 0.8 degrees  0.8

West Magnetic Variation  W

Mode indicator = Differential  D

*39  Checksum