Upon turning on your NavNet, you will eventually see a completely black screen containing a disclaimer. At the bottom of the screen, you will see a long list of numbers. Like the picture on the left. This is version 24 of a Navnet 1 (Navionics). Don’t pay any attention to the number after the comma or the numbers before 24. Your version number may be different. Just remember the last two numbers before the comma is what version you’re dealing with. Although it’s always better to get all the digits just in case you mess up. And that’s it. There are a few other ways to find this same number but this one is by far the easiest. The VX2 displays it’s software version the very same way. Just be sure that you tell whom ever you speak to which navnet it is.