Here you can find the documentation page with all the all environments, technologies, and versions supported by Dynatrace:
Microsoft Navision isn't listed on this page, so as far as I know, there is no support for this technology yet.
When googling around (wikipedia is your friend), it seems that in the old days Navision was built in C/AL, but it has been ported to .Net. So if you are talking about a local installation of Navision, you would stand a chance to see the workings in Dynatrace. However, it might still use old code blocks from the past which will not be instrumented.
So you could give it a try, and it’s quite likely that you would see the majority of actions in Dynatrace.
If you are talking about saas based navision365 I guess you are in less luck.
Did you already try to instrument your environment and did it work? I’m very curious because I also got a question from a prospect.