Coordinates
Latitude vs Longitude
Latitude is north–south (−90 to 90). Longitude is east–west (−180 to 180). CoordMap writes latitude first. If a “latitude” is 120, the pair is almost certainly swapped or in the wrong CRS.
Side-by-side differences
Latitude parallels run east–west and measure north–south position. Longitude meridians run north–south and measure east–west position. Only latitude has a nearly constant ground distance per degree. Only longitude is used, historically, to define hour-wide time bands.
Catching swapped values
Paste a pair into the latitude/longitude finder. If the marker jumps to the wrong ocean, swap the numbers or convert from another CRS. Web Mercator values are metres (millions), not degrees. UTM values need a zone and hemisphere, not a simple lat/lng pair.
Examples
40.7128, -74.0060-74.0060, 40.7128 interpreted as lat, lngCommon questions
Which number do I type first?
On CoordMap tools, latitude first, then longitude. City pages follow the same order in decimal, DMS and DDM rows.
Do maps always use this order?
No. GeoJSON and many GIS APIs use longitude, latitude. Always read the specification for the file or API you are using.