Ok, you're thinking of nodes as used in the WED, aren't you?
But if it is so, forget about that. Just use in extra layer (you can combine it with the influence map) or use your influence map as the layer for the nodes.
You should have something like this (for 5x5 tiles)
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25
All you have to do is to find out in which tile is your unit and in which tile is your goal, then start the pathfindingsysteme and erverything should work.
The tile is your node or in an extra layer some nodes belong to one tile.
Is this your problem? If it is not, please make an example.
Bye G.S.