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My garmin will idle after turning it on "aquiring satelites", after awhile it will give me the white screen "trouble tracking satelites, are you indoors now?" answer "no"when the garmin asks you if you are in a particular state answer "no". It works for me everytime, don't know why, just that it works to lie sometimes.
You need to have Garmin Tech support send you this attachment; "gmapprom.unl" Then follow the instructions below.
Save the attachment from our message to the desktop
Right-click the file gmapprom.unl, and click copy
Click on My computer
Click on the Garmin Nuvi drive
Click on the Garmin Folder
Rightclick a blank white space in this Garmin folder
Click Paste, and note gmapprom.unl file is listed, please also delete
gmapsupp.img if present
Unplug the device, and allow to start up
How long has it been since you updated the firmware on your unit? Try updating and see if this helps. Also, keep in mind the receiver on the C330 is not as sharp as on other units like the C550 and some of the Nuvis. You may have problems while under overpasses, between large trees or buildings, etc. This is just a design limitation of the unit.