It makes more sense that the numbers correspond to pages from his first book. I don't think the message is going to the toad sage cuz whats he gonna do with them. The toad sage would go to the battle field? I highly doubt that. And because those are clearly commas and not periods, I don't believe they are coordinates cuz coordinates aren't written that way.
I can imagine now, them retrieving the first book and looking at those page numbers but not finding anything of use. Then Kakashi finds out about it, they tell him they think it's page numbers to Jiraiya's book. Kakashi then instantly thinks about Icha Icha Paradise and goes "Aha! So that's Pein's secret!", because of course Kakashi has the book completely memorised from reading it 24/7 ^_^
I was joking...didn't you saw me saying that it was the chapter released of naruto. not the chapter in J-man's book.
actually I didn't said it but ...mmm...well you could have read my thoughts...