I just purchased iGeocacher for my iPhone, rapidly followed by a premium member subscription to Groundspeak for lists of nearby geocaching location files.

So I have now managed to download 500 location files from Groundspeak, uploaded them to a set location on my own webserver, and let iGeocacher download them to the iPhone.

So now on to learn how iGeocacher really works

The iGeocacher is a small application that allows me (and you) to parse the data in a set of geocaching files in .loc or .gpx format and then display them via a web application in the safari browser on your iPhone. The lat/lon coordinates are coupled to the Google maps function so that you just touch the icon or link on the desired target and you'll see it depicted on Google maps. Just touch the directions button and get detailed driving instructions to your waypoint

[From iGeocacher]

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