Did anyone realize cGPSmapper speaks Garmin NT?
Hi list I remember many discussions and comments about how mkgmap produces Garmin's legacy format only and the NT format is still a mystery. Today, I was pointed at a discussion of the Polish UMP project (similar to OSM, strongly concentrated on Poland and surrounds). As I happen to be Polish and thus read the language, I browsed their wiki. I noticed that they are producing Garmin NT maps. And then I found that their tool chain is based on cGPSmapper [1]. So, is the Garmin NT format considered reverse engineered now that the cGPSmapper source is open? Or has this interesting fact been missed somehow (I certainly was unaware of it until today)? - Bartosz [1] http://ump.fuw.edu.pl/wiki/Kompilacja_mapy
On 26.04.2011 17:43, Bartosz Fabianowski wrote:
Hi list
I remember many discussions and comments about how mkgmap produces Garmin's legacy format only and the NT format is still a mystery. Today, I was pointed at a discussion of the Polish UMP project (similar to OSM, strongly concentrated on Poland and surrounds). As I happen to be Polish and thus read the language, I browsed their wiki. I noticed that they are producing Garmin NT maps. And then I found that their tool chain is based on cGPSmapper [1]. So, is the Garmin NT format considered reverse engineered now that the cGPSmapper source is open? Or has this cgpsmapper is not open source. Only parts of it are open sourced.
Well lets hope all of it becomes open source (for one example address index by cgsmapper seems to be more correct than mkgmap address index). NT format should be optional in any case. Old GPS like all etrex series or 60CSx work much slower once an NT map is loaded (even if it is deactivated).
interesting fact been missed somehow (I certainly was unaware of it until today)?
- Bartosz
[1] http://ump.fuw.edu.pl/wiki/Kompilacja_mapy _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
Hi list
I remember many discussions and comments about how mkgmap produces Garmin's legacy format only and the NT format is still a mystery. Today, I was pointed at a discussion of the Polish UMP project (similar to OSM, strongly concentrated on Poland and surrounds). As I happen to be Polish and thus read the language, I browsed their wiki. I noticed that they are producing Garmin NT maps. And then I found that their tool chain is based on cGPSmapper [1]. So, is the Garmin NT format considered reverse engineered now that the cGPSmapper source is open? Or has this cgpsmapper is not open source. Only parts of it are open sourced.
Well lets hope all of it becomes open source (for one example address index by cgsmapper seems to be more correct than mkgmap address index).
NT format should be optional in any case. Old GPS like all etrex series or 60CSx work much slower once an NT map is loaded (even if it is deactivated).
interesting fact been missed somehow (I certainly was unaware of it until today)?
- Bartosz
What's the difference between 'old' Garmin format and NT format? Is it that NT maps are using the GMP subformat to group tiles into larger packages? Or are there any other specifics? Support for the GMP subformat should be possible. Some time ago I have written a parser of the GMP subformat for the display project and that was not a very big deal. WanMil
On 26.04.2011 19:08, WanMil wrote:
Hi list
I remember many discussions and comments about how mkgmap produces Garmin's legacy format only and the NT format is still a mystery. Today, I was pointed at a discussion of the Polish UMP project (similar to OSM, strongly concentrated on Poland and surrounds). As I happen to be Polish and thus read the language, I browsed their wiki. I noticed that they are producing Garmin NT maps. And then I found that their tool chain is based on cGPSmapper [1]. So, is the Garmin NT format considered reverse engineered now that the cGPSmapper source is open? Or has this cgpsmapper is not open source. Only parts of it are open sourced.
Well lets hope all of it becomes open source (for one example address index by cgsmapper seems to be more correct than mkgmap address index).
NT format should be optional in any case. Old GPS like all etrex series or 60CSx work much slower once an NT map is loaded (even if it is deactivated).
interesting fact been missed somehow (I certainly was unaware of it until today)?
- Bartosz
What's the difference between 'old' Garmin format and NT format? Is it that NT maps are using the GMP subformat to group tiles into larger packages? Or are there any other specifics? NT is a compression. It takes less space for maps that have autorouting data, it takes more space for all non autorouting objects AFAIK. Also it needs more processor power on GPS. It has nothing to do with GMP subformat. Basically no additional features require NT. (not even 3d buildings or "lanes" or "real junction view" and so on). I think 1 or 2 special things need NT format though.
Support for the GMP subformat should be possible. Some time ago I have written a parser of the GMP subformat for the display project and that was not a very big deal.
WanMil
On 26 April 2011 18:21, Felix Hartmann <extremecarver@gmail.com> wrote:
Basically no additional features require NT. (not even 3d buildings or "lanes" or "real junction view" and so on). I think 1 or 2 special things need NT format though.
Ah, I should have waited a minute before pressing send. Do you know about the specific example of speed limit display? Dermot -- -------------------------------------- Igaühel on siin oma laul ja ma oma ei leiagi üles
See my next message. Speed limits and lane support needs NT. On 26.04.2011 19:24, Dermot McNally wrote:
On 26 April 2011 18:21, Felix Hartmann<extremecarver@gmail.com> wrote:
Basically no additional features require NT. (not even 3d buildings or "lanes" or "real junction view" and so on). I think 1 or 2 special things need NT format though. Ah, I should have waited a minute before pressing send. Do you know about the specific example of speed limit display?
Dermot
On 26 April 2011 18:08, WanMil <wmgcnfg@web.de> wrote:
What's the difference between 'old' Garmin format and NT format? Is it that NT maps are using the GMP subformat to group tiles into larger packages? Or are there any other specifics?
The word on the street is that newer features like speed limit display and lane assist only work on NT maps, though of course, that may not be down to the format itself. There are indications that the UMP maps may support lane assist, though I have no way to verify this. Dermot -- -------------------------------------- Igaühel on siin oma laul ja ma oma ei leiagi üles
On 26.04.2011 19:22, Dermot McNally wrote:
On 26 April 2011 18:08, WanMil<wmgcnfg@web.de> wrote:
What's the difference between 'old' Garmin format and NT format? Is it that NT maps are using the GMP subformat to group tiles into larger packages? Or are there any other specifics? The word on the street is that newer features like speed limit display and lane assist only work on NT maps, though of course, that may not be down to the format itself. There are indications that the UMP maps may support lane assist, though I have no way to verify this.
Dermot
okay, I just read through docs. The following features are the only ones which seem to need NT: Speed limits multiple language support postal code filtering lane connections and junction view (note both not supported by Mapsource, mapsource cannot send this info to the GPS) Not needed and possible without NT: Date time modifiers (for restrictions) --- would be really nice if mkgmap supported this (it could give a push in OSM for such data) Traffic events RDS extended turn restrictions DEM
UMP maps do a primitive form of lane assist. The label at the top of the nüvi screen changes from "Some Street" to "Some Street (<lane name>)" in advance of a complex turn. That is all. No pretty pictures of junctions and lanes: http://ump.fuw.edu.pl/wiki/Asystent_Pasa_Ruchu - Bartosz
participants (4)
-
Bartosz Fabianowski -
Dermot McNally -
Felix Hartmann -
WanMil