The following is what someone got from GARMIN customer support, which I think you may already know. The trick is to drop your favorites GPX file into the POI folder on your computer and run the Garmin POILoader app on it to create a new GPI file, and then load the new GPI file into the 430N. The Favs you imported usually end up in the 430N extras folder. Now you have to click on each of the the POIs you loaded and select save and the 430N saves the POI into your favorites. It does save typing the information for each individually. Some then reload their original GPI POI files which erases the Favs folder on the 430N. You may have to do some clean up. I'm stuck with a 730N, so I personally have not tried it.
Thank you for contacting Garmin International. I can definitely help you with your question about the Jeep unit. Please use a USB stick and following these directions:
Step 1 - Download a POI database file from the web or create your own
Step 2 – Using POI Loader from Garmin (www.garmin.com/products/poiloader
) create the POI.gpi file from the database file you have gotten from the web or created
Step 3 – Save the POI.gpi file to your computer as a file
Step 4 – You will now need a USB Stick to load the custom POI to so that it can be loaded to the vehicle system. Create a folder on a blank USB stick entitled Garmin, example; if your USB Stick is listed as drive D by your computer, then the folder would be D:\Garmin
Step 5 – Create a folder within the Garmin folder named Poi, example; if your USB Stick is listed as drive D by your computer, then the folder would be D:\Garmin\Poi
Step 6 – Copy the POI.gpi file to the Garmin\Poi folder on the USB Stick, example; if your USB Stick is listed as drive D by your computer, then the file location would be D:\Garmin\Poi\POI.gpi
Step 7 – Insert the USB Stick to the radio and the Garmin navigation application will display a message that the custom POIs are ready to be copied, select yes.
Step 8 – To view the custom POI list select WhereTo, Extras, Custom POIs and you will see the list.