Just a thought, if you have a smart phone, use the compass on it and pick up a smart phone holder for either the dash or window mount. I use the compass on my IPhone4S to zero in my Direct TV dish, it is amazingly accurate and easy to read.
Don't have a compass on your smart phone, well your only an app away.
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2018 Berkshire XL 40B
Past RVs: National Pacifica 40', Kenworth T300 Toterhome, Jayco Class C 32'. American Eagle 40',
American Eagle 40', Bounder 38' tag axle
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