Chipset

I assume that it is a firmware update to the installed SIRF chipset to improve performance.

See I see it as a physical thing, like the Intel chipset. They are actual physical IC pieces.

Ok, here is on definition I have found...

"A number of integrated circuits designed to perform one or more related functions"

Now, a chipset may be one of those terms that is commonly misused, but everyone knows what they are talking about...for instance, cows!!! Not all bovines are cows...only the female ones...lol.

Sorry about the cow example, not the best, but I use to milk cows for a few years and I love cows!

A chipset is a group of related circuits/components that perform a particular function. For example, if you want to build a Windows computer, you can choose from many different motherboards. They, in turn, may have various chipsets; some may have an Intel processor, others AMD. The processor, and the other components that perform peripheral functions, are the chipset. (There may,in fact, be several different chipsets for different functions.) With respect to a GPSr, the chipset is the hardware inside. You interact with it through the screen, and any other buttons or controls your unit happens to have. You can't get a different chipset by upgrading the firmware - what you get is the most up-to-date set of instructions for that particular chipset, which control its functions. But the chipset is hardware. So "upgrading to get a new chipset" means selling the GPS you have and buying another one.

Who cares? It all works just fine. I like cows, too. I love me some choice heated cow parts every now and then.

As stated above, chipsets are physical components that makes up the device, in this case the GPS receiver. The only available upgrade for GPSr are software which can be maps, application or firmware.
To upgrade chipset means buying a new GPSr.

I am glad that everyone agrees with me then.