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Discuss True south or magnetic south?? in the Solar PV Forum area at ElectriciansForums.net
i suppose that a 180deg. reciprocal bearing from magnetic north would give a false bearing for true south, but the difference will not change the world of solar power, IMO.
Oh....and if you want to verify that it works before you head to work tomorrow morning: try it out from your house by imagining where the sun came up this morning (probably shortly after 7am if you have a nice open view to the SouthEast), then imagine where the mid-day (South) sun is in your garden at this time of year, then imagine where the sun sets (around 5pm today if you have an open aspect to the SouthWest).Point the hour hand of your watch in the direction of the sun.
The mid-way point between the hour hand and the number 12 will be South.