Why do I now see the NavService app on my MacBook Air? How do I 'undo' that?

Since a couple of weeks, whenever I start my MacBook Air, an application called NavService is loaded automatically. I checked the list of applications to start at login by going into System Preferences, but it is not listed as an application to start automatically.
The application shows up when you switch between applications but I am not sure what it does and confuses me.
I have also searched the OSX Lion community and did not find anything on the topic except for one dialog hat I don't really understand.
Does anyone have an idea what could cause this and how I get it to no longer do this?
Thanks!
Alwin.

Do you use Navionics for marine a marine chart plotter? I noticed that after I installed all their (lousy) software on my MPB, this Navservice app would start up each time I booted. It took me a while, but I tracked it down to the "LaunchAgents" folder in my system library. Siince I quit the app each and every time I boot my MBP, I decided I didn't need it so I simply renamed the file from "com.apple.NavService.plist" to "com.apple.NavService.plist.old" and rebooted my MBP. Voila, no more NavService app running in the background.
As far as the purpose of this thing, the plist entry is launching the following app:
/Applications/Navionics World/NavService.app/Contents/MacOS/NavService
Take a look and see if you have the same thing.
The Navionics software for the Mac is obviously written by someone that doesnt' understand how Macs really work, and they scattered junk all over the place with their install routines. In fact, if you update the software it will place redundant copies in redundant folders, etc. making it impossible to know which versions are the latest, etc.

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Why do I now see the NavService app on my MacBook Air? How do I 'undo' that?

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