I've got a Window 10 Preview VM (not a local machine, so no way I can set up or test Navilink I think.)
Without doing anything special to the machine, just a raw Windows 10 machine with no applications installed, Cesium (the mapping but of ka72.com and windwanderers.org.au) doesn't work in Internet Explorer, Firefox or Spartan.
After installing Chrome, it works in Chrome fine.
The error messages I got in IE and Firefox led me to believe that the issue with these browsers is video driver related, and most likely not an issue on a recent machine with up to date display drivers.
The error message in Spartan leads me to believe it just doesn't work with WebGL yet. Not to the level required for Cesium, anyway. No surprises there, it's a new browser.
This is with the Preview version of Windows 10.
My advice is, for the moment, if you are running Windows 7 or lower, stick with that for a bit longer. (Don't rush to 10.)
If you are running Windows 8, I suggest you create a USB Recovery Drive first in case you want to go back.
support.microsoft.com/en-us/help/17422/windows-8-create-usb-recovery-driveBe prepared to install Chrome as a fallback browser.