When trying to down load a file I keep getting it is in an unsupported format

I surmise at one point those files (ending in .bin) were set to "open with" the program used to communicate with that GPS receiver, so double-clicking them would automatically launch that program. Everything worked seamlessly and you had no reason to question it.

For whatever reason that file / program relationship became severed, and now double-clicking the .bin file icon is launching Archive Utility instead. The solution is to select the file, then control-click (or two-finger tap, whichever is your preference) and select "Open With" from the contextual menu that appears. Select the program (app) you use to communicate with the GPS receiver.

This presumes one major caveat: that the program you used in the past continues to work with macOS "Ventura". If it does not, you need to update that program to a compatible version or otherwise determine what you need to communicate with that GPS.

These are very likely compiled firmware updates and not zip archives, so double-clicking on it or attempting to "uncompress" it will cause the operating system to bail as it is not a supported file type.

Does the radio have software support that allows you to apply this "firmware" update to the radio?

Thanks but you did not answer my questions. That screenshot suggests you are using Archive Utility to open it, which is an inappropriate app to use.

If that file is to be used in conjunction with an app to update your radio, then open that app first. Typically, you would then use that app's File menu to open the binary file.

Software that updates firmware typically wants you to show it where the firmware update file (*.bin) is located, so it can load that data and apply it to the GPS receiver. Double-clicking or choosing open with from a Finder secondary menu may still not result in the application opening and applying that firmware to your receiver.

And as John Galt points out, if the software that applies the firmware, or drivers for that receiver, or the physical receiver is incompatible with Ventura, then you are at a roadblock until the GPS receiver vendor offers that support.

What format is the file? How are you trying to download it?

"It is a bin..." as in, a binary file?

Select the file then File > Get Info. What is its Kind?

What are you using to open it?

You are welcome.