Hi Dennis,
The magnetic declination varies considerably from location to location and over time. After you have performed a drift alignment, couldn't you just use your compass to determine what it is for your location? Your mounting will be aligned very accurately Noth/South after a drift align.
I get a rough alignment by remembering the angle of the mount with the edge of the verandah. Then I drift align from there.
Sorry I can't be of more help.
Have fun,
Doug
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