Garmin custom map tiling software

[james222]

Hello!

Let me start by saying that I checked Google, searched the forum and Garmin tutorials page but did not manage to find a good answer.

So... when making Garmin custom maps from jpg files (usually scanned old paper maps) - I use image overlay in Google Erath , calibrate, export to kmz etc - but then I have to use a program to split the (usually) large map into tiles to see on my Garmin Montana.

I haven't done this in a while and now I see that Okmap software that I used is not free anymore

Any other free programs to simply split a jpeg/kmz custom map into tiles?

Thank you

[Giomen]

How big is your JPEG map? Do you try to use JNX format for Montana?

[james222]

I do not use JNX format at all; Just a large jpg image overlay (more than 3MB) that I need to cut into tiles of less than 3 MB.

Here is a link to Garmin limitations:

Please Login or Register to see the links

So as you can see I need to have maximum 500 jpg /KMZ and 3MB maximum size of each tile.


Later edit: I have found a free program just for map tiling called KMZFactory - it's very basic and the interface is spartan but it gets the job done ... and FREE

[Giomen]

Use free JNX and you will be free from all limitation!

number of levels of detail: JNX up to 5 KMZ - only one
number of tiles: JNX - up to 50000 per level KMZ -max. 100 per device (!), up to 500 in Montana
subjective rendering speed: JNX - high KMZ - low
supported image type: JNX - any type KMZ - Jpeg
image size: JNX - up to several Gb KMZ - 3MB

[james222]

Thanks for the info. I will look into JNX files but from what I see they require changing Garmin firmware to work on device.

One advantage however of jpg/KMZ combination is that they are very easy to make in Google Earth, work in any device without any changes to firmware.

[Giomen]

Thanks for the info. I will look into JNX files but from what I see they require changing Garmin firmware to work on device.

In any case you need to update device from time to time! I do not force to use JNX to you, but for me it is the significant improvement of Garmin device.