2026-09-08
Magnetic Declination Across the US and Why Your Compass Lies
The United States has one of the widest ranges of magnetic declination of any country. On the Pacific coast a compass needle points well east of true north; in Maine it points well west. Between them, a line runs down the middle of the country where the two coincide. If you find the qibla with a compass and ignore this, you can be off by more than fifteen degrees.
Two different norths
True north is the direction of the Earth's rotational axis — the direction the qibla calculation uses. Magnetic north is where the planet's magnetic field points, and it is somewhere in the Canadian Arctic, drifting a few tens of kilometres a year. The angle between them, seen from where you stand, is the magnetic declination. East declination means the needle points east of true north; west declination means the opposite.
The American picture
Roughly speaking, declination in the continental United States runs from about fifteen degrees east in Washington State and Oregon, through a zero line that crosses the country somewhere near the Mississippi, to about fifteen degrees west in New England. Alaska is more extreme still. Because the field drifts, these values change slowly year by year, which is why a good compass app or map states the year its values are from.
Correcting by hand
If your declination is east, subtract it from the true bearing to get the magnetic bearing to set on your compass. If it is west, add it. For example, a true qibla of 58 degrees in a place with 14 degrees west declination becomes 72 degrees on the compass. Getting the sign backwards doubles the error, which is the single most common mistake. On every city page we do this for you and print the magnetic reading directly, so you do not have to decide which way to go.
Does your phone already correct it?
Usually yes, but not always in the way you expect. Most phone compass apps offer both a magnetic and a true reading, and which one they show by default varies. If your app can display both, use the true bearing and compare it to the calculated qibla directly. If it only shows magnetic, use the magnetic figure from the city page.
The bigger error is usually local
Declination is a smooth, predictable, continent-scale effect. What actually ruins most compass readings is local: a magnetic phone case, a car mount, a wireless charging pad, a laptop, a radiator, structural steel, a parking garage. These can swing a needle by tens of degrees with no warning. Step away from metal, take the case off, and calibrate by moving the phone in a figure-eight before trusting the reading.
The check that needs no compass
At the moment Dhuhr begins, the sun is due south. That is not noon on the clock; it is the time printed on your prayer times page. Face the sun at that moment and you are facing true south, with no magnetic correction involved at all. From that reference you can lay off the qibla angle for your city — and you can mark it once and use it indefinitely.