Thread: Converting JNX to raster IMG

Thanks. I was using JNXSCALE to do this. This was the results:

JNX Scale Value: 14, JNX2IMG prompts about not displaying under 200m. Displays between: 5m and 200m
JNX Scale Value: 783, Displays between: 5m and 200m
JNX Scale Value: 839, Displays between: 5m and 200m
JNX Scale Value: 965, Displays at 300m only
JNX Scale Value: 1447, Displays at 300m only


I now tried JNXCustomizer, but the results are the same. I set it to 500m, but on the device, it shows form 5m to 200m, then goes to the "Worldwide DEM Basemap,NR :-(

I have all other maps disabled, but it looks like it needs this Basemap to display anything. With the basemap disabled, no maps display.

Thanks Giomen!

I re-read the first post here, the known limitations and issues of the current version explain what is happening perfectly:

1. All the JNX levels with the scales below 864 will be mapped into a lowest zoom level in IMG, it becomes visible from 200m and closer in the devices. If there is more than one level in your JNX with small scale value, the converter will only use one of them - one with lowest scale value (i.e. the most detailed one).

2. JNX levels are displayed in more than one zoom. For example, a level with the scale value 4777 is visible from 1.2km down to 5m (if more detailed levels are not present in the device). In IMG, in contrast, the level is only shown in the specified zooms, so, to emulate a JNX way of displaying the tiles, they should be placed in all the necessary zooms explicitly.
Current version of the converter does not provide this emulation.

So I guess we have to live with it until the application is updated to solve those issues.

It is still usable for me on the 5m to 200m setting, but not ideal.

For device with JNX support the pure JNX format is more convenient.

AFAIAA, I have to hack my firmware though to use JNX. I'm not sure if that is more convenient, and it is not as safe. Also, it means I can't share maps I made with friends unless they have also hacked their device. Correct me if I am wrong about this :-)

Originally Posted by Giomen

Screenshot from GPSMAP 421s - map series 23 is working for vector and raster data but default map series 36 is showing only vector on all level

Have you tried the same thing, but with the MapSeries set to 29 or 31?

Cnfhbr has found out why the maps made with jnx2img were not displayed in Monterra.
I've changed the converter accordingly, and it seems that maps work correctly, at least in Monterra and GPSMAP 62.

The updated converter can be downloaded from the link in the first message of this thread.

Giomen, could you please check if the maps made with the new version of jnx2img show up correctly in chartplotter?

Where do you download JNX files?