First lets look at the trend data for "satellite navigation" by typing it in to Google suggest:

Looks like it has a good search volume -- meaning that lots of people are typing this word into the Google search engine everyday (the fact that data shows up on Google Trends at all indicates this). Also notice that the trend is going down though.
If we were to use some keyword suggestion tools such as the Google Adwords keyword tool or Keyword Discovery, we would find that there are related terms that people appear to be searching for more often than "satellite navigation". One of them is the term "satnav". This means exactly the same thing as "satellite navigation", it is just an abbreviation.
Let's now plot "satnav" against "satellite navigation" in Google Trends to see what the difference in serach volume is:

You can see that at some point in 2005 people began using the term "satnav" to refer to satellite navigation products and over time this term has surpassed "satellite navigation" in the amount of times it is searched.
But can we do any better? What about trying "sat nav" -- the only thing different being the space. Let's plot all 3 against each other and see what we come up with:

The difference is huge. And just think, you may have never thought to use these other terms on your own. If you were to dig a bit deeper you would find that "satnav" and "sat nav" are primarily used in the UK which is also very useful information to have.
Google Trends is great for experimenting with different keyoword combinations. Check it out for yourself at www.google.com/trends and let me know if you find anything interesting.


