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> be me
> Practice charting time.
> take a lot of time taking measurements around my basement.
> Take measurements back to charting table.
> Absolutely fucked.
> Repeat measurements repeat charting.
> Still fucked.
> Drop pen in frustration
> North changes.
> That was several hours of my life.
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>>2854433
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I do this as a job, it's called surveying
Don't use a compass inside a building, if you need a bearing reference get a point outside and find it's bearing to a point inside, ideally straight north, and then turn that angle using like a protractor under a string line to get the bearing of your first indoor line to the next point
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>>2854443
It's really just practicing the steps. I know they compass is getting pulled all over the place. It is shocking how far off I still am no matter how careful I am when doing it.
If I had steady instruments I would be closer but some of these are of by 2 or 3 feet.
I plan on doing the radio towers in town next, but I am not sure if the mistakes are exagorated on the smaller scale or if they will get worse when I go to a large scale.
i really hope the relative accuracy goes up with scale.
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>>2854443
waaait wait wait wait
so let me get this straight
OP posts on /out/ and essentially OP wants to create maps
for the purpose of which OP probably got a compass delivered using amazon prime
OP then tries to, using a compass, draw a map of his domicile, fails, throws a fit and gives up?
Pottery.
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Circumstance of a circle of a with a radius of 1 mile, then decide that number by 360. I thing I was taught it's a ruff 175 feet.
If the best resolution you can get is 1 degree than that is like the minimum inaccuracy you will see when using radio towers that can be many many miles away.
Your pocket compass isn't for charting it's for navigating. Given a good map that same compass can give you your location with greater accuracy.
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>>2854433
Not being a dick, but I'm not quite sure what you're trying to achieve here.
Accurately map your basement?
Surely all you need is a tape measure.
Why is this important? Wouldn't it be easier just to get the plans for your house?
If plans vs. construction are anything like where I live, tolerances are as follows. Surely this is accurate for any conceivable purpose?
Location on Site: Within 15mm of the plan.
Building Footprint/Wall Location: ±5mm for every 200mm of length (e.g., ±5mm on a 200mm wall).
Vertical Deviation (Out of Plumb): Around 15mm per two storeys (or 5mm per 2.4m height).
Surface Flatness: Different finishes have different rules (e.g., U3 trowelled floors: <3mm abrupt changes, <5mm gradual).