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Re: [gpsd-users] Create fakegpsd input from coordinates

From: Peter Jenik
Subject: Re: [gpsd-users] Create fakegpsd input from coordinates
Date: Mon, 6 Mar 2017 14:53:19 +0100

Hi Attila,


I would build a NMEA File and then feed it to gpsfake. Building a NMEA File from your coordinates should be easy:



Geographic Position, Latitude / Longitude and time.

eg1. $GPGLL,3751.65,S,14507.36,E*77

eg2. $GPGLL,4916.45,N,12311.12,W,225444,A

           4916.46,N    Latitude 49 deg. 16.45 min. North

           12311.12,W   Longitude 123 deg. 11.12 min. West

           225444       Fix taken at 22:54:44 UTC

           A            Data valid

eg3. $GPGLL,5133.81,N,00042.25,W*75

               1    2     3    4 5


      1    5133.81   Current latitude

      2    N         North/South

      3    00042.25  Current longitude

      4    W         East/West

      5    *75       checksum

$--GLL,lll.ll,a,yyyyy.yy,a,,A llll.ll = Latitude of position

a = N or S
yyyyy.yy = Longitude of position
a = E or W = UTC of position
A = status: A = valid data


courtesy of


Convert your Lat/Lon accordingly (Degrees*100+Minutes.<point>decimal fraction of minute) When omitting the time and using “A” instead of calculating a checksum then do not forget to insert the extra comma, it might be needed.





Von: gpsd-users [mailto:address@hidden Im Auftrag von tom schuring
Gesendet: Montag, 06. März 2017 08:25
An: GPSd-users; Salamon Attila
Betreff: Re: [gpsd-users] Create fakegpsd input from coordinates



The logfiles may contain packets in any supported format, including in particular NMEA, SiRF, TSIP, or Zodiac. Leading lines beginning with # will be treated as comments and ignored, except in the following ......

So I would Google for "generate nmea file"

And try a few of the simulators that come up in the result.

Or dive into the nmea spec and hand generate them.

Perhaps someone else has a quicker way.


On 6 Mar 2017, 5:39 PM +1100, Salamon Attila <address@hidden>, wrote:


(Sorry for my english.)

I have GPS points of a path in text format:
latitudeN,longitudeN .

Latitude and longitude are floating point numbers.
How can I create an input file for fakegps from the coordinates?

Thanks in advance,
Best Regards,
Attila Salamon

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