My loom (a Louet Jane 70) has a built-in raddle, with 5 slots to the inch. I drew up a chart of how to split up the warp ends. Thought it might be useful.
My 'phone battery seems to have suffered since this weekend's jaunt using it as a satnav. A pity, as it's a Nexus 4 and involves some careful disassembly to replace the battery. Will have to think about this!