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

From: Fulup Ar Foll
Subject: Re: [gpsd-users] Create fakegpsd input from coordinates
Date: Tue, 7 Mar 2017 12:29:54 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

For your information,

GeoGate provides a NMEA+AIS simulator[1] this simulator takes as input a GPX route and generate either NMEA or AIS packet.

Hope it will help.



On 06/03/2017 14:53, Peter Jenik wrote:
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 <mailto: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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