Thank you for all your comments.
I've been reading a lot about this, there was even a topic here on gpspower where there was a video teaching how to make the first SVG from speedcam to nextgen, however the author or youtube deleted the video.

@Andrey Form
I have been reading @LouBouha tutorials, in fact it is on them that I have based myself to learn, in fact it is to thank @LouBouha, because his tutorials are essential for those who start in SVG, maybe not the best method, but to learn they are interesting.
Your illustrator codes have given me interesting information, thank you.

@Birbante
I have been reading your posts and have them saved, for example these:
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With all due respect, because I know you understand the subject and I understand that it is not necessary to use two types of illustrator, read this comment by batiskaf:
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Thanks for your post, especially the info about the resolutions, it gave me new ideas to make my first SVG inventions.

@Alain57
Hi, any user who participates in gpspower knows that you know a lot about SVG too, I have been watching your works.
However, @Andrey Form understood what I meant and builds on that:
Quote Originally Posted by Andrey Form View Post
Hi,
... 1 way, converting bitmap images to vector format (svg), this method is the fastest, but the files are large...
I know there is a table in illustrator to lock the size (enlargement) of an SVG for web pages, so I thought there was something similar for iGO NG, with your very useful information, after all it is iGO that manages the size. With your replies I now have enough information to create my first SVGs.

Quote Originally Posted by Alain57 View Post
...Of course, it is preferable to respect the dimensions provided by the various original files .......
Tank you.