I'm waiting for my GPS to arrive in the mail, so I can't recall much until I get going on it again. I believe IGO makes the poi-visibilities if it isn't already set as a default inside the branding.zip. I had a test gps, but it no longer functions.
I believe the 0 is off, and the 3000, 5000 etc is the distance. Look at a particular gas station icon and the the visibility in the igo GUI. Then take a look at your poi_visibilities and you will see the changes.
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