New to coordinates? What is Lat/Long? What is UTM? What is MGRS?

Difference Between Latitude and Longitude

Which one goes up and down, and which one goes left to right? Here is the easiest way to remember.

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The Simple Explanation

LATITUDE lines run flat like a ladder (Lat = Ladder). They measure North and South. LONGITUDE lines are long vertical lines running from the North Pole to the South Pole.

Real World Example

The Equator is the most famous line of Latitude (0). The Prime Meridian (in London) is the most famous line of Longitude (0).

Pro Tip

When entering coordinates into map apps, always double-check if there is a negative sign (-). Missing a negative sign on longitude will place you on the opposite side of the planet!

Frequently Asked Questions

Which number is written first?

Latitude is always written first, followed by Longitude (e.g., 34.05 N, 118.24 W).

Warning: Verify Your Calculation

Coordinate accuracy varies by device and datum. Do not use these results for legal or construction purposes without checking:

GPS Accuracy Alert

Your phone's GPS can be off by 30 meters. This can cause critical errors in your data.

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Datum Shift Risk

Using the wrong coordinate system (e.g. WGS84 vs NAD83) creates a permanent 1-meter offset.

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Professional Context: Why Precision Matters

The WGS84 vs. NAD83 Dilemma

Most beginners assume that all latitude/longitude coordinates are the same. However, in North America, the difference between the WGS84 (used by GPS) and NAD83 (used for local surveying) can result in a physical shift of up to 1 meter. For high-precision construction projects, failing to account for this "datum shift" can lead to catastrophic misalignment of foundations or property boundaries.

Coordinate Drift Over Time

Tectonic plate movement means that your physical location on Earth is constantly moving relative to the GPS satellite network. In regions like Australia, this drift is significant enough that coordinate reference systems must be updated periodically. Our tools utilize the most stable geodetic algorithms to ensure that your conversions remain mathematically sound across different epochs.