Number puzzle

[blueterrier]

8293 325698 2365398 These are the first three of a series of numbers. Can anyone decode them for me?

[squarebear]

It's something to do with geocaching:

http://www.geocaching.com/seek/cache_details.a spx?guid=72d8753f-a743-404c-80a8-9df2d17fd99d

[blueterrier]

Thanks Squarebear but thats where I started from. The series does not include 0 or 1 so I think it is something to do with a phone keypad but it only has one 4 and one 7 so I am stuck!