Question 1

What is the difference between DD, DMS, and DDM?

Accepted Answer

Decimal Degrees (DD) expresses a coordinate as a single decimal number, e.g. 48.8584°. Degrees Minutes Seconds (DMS) splits it into degrees, minutes (1° = 60'), and seconds (1' = 60"), e.g. 48° 51' 30.24". Degrees Decimal Minutes (DDM) uses degrees and decimal minutes without seconds, e.g. 48° 51.504'. GPS devices, aviation, and nautical charts often use DMS or DDM; web maps and databases prefer DD.

Question 2

What is UTM and when should I use it?

Accepted Answer

Universal Transverse Mercator (UTM) is a metric grid system that divides Earth into 60 zones, each 6° wide. Coordinates are given as Zone (e.g. 31T), Easting (m), and Northing (m). UTM is ideal for measuring distances and areas because a metre is a metre everywhere within a zone. It is widely used in surveying, GIS, and military mapping.

Question 3

Why is the longitude negative in some cases?

Accepted Answer

Longitudes west of the Prime Meridian (0°) are negative in signed decimal format. For example, New York is at approximately -74.0° (or 74.0° W). The DMS format uses direction letters (E/W) instead of a sign, so -74.0060° and 74° 0' 21.6" W are equivalent.

Question 4

What is a Geo URI?

Accepted Answer

A Geo URI is a standardized link format (RFC 5870) for geographic coordinates: geo:latitude,longitude. Clicking a Geo URI on a mobile device opens it in the default maps application. It's useful in HTML pages, NFC tags, and QR codes to link to a specific location.

Question 5

Does the converter handle the Norway and Svalbard special UTM zones?

Accepted Answer

Yes. The tool correctly handles the special UTM zone exceptions: zone 32 is extended to cover southern Norway (latitude 56°–64°, longitude 3°–12°), and zones 31, 33, 35, 37 are widened over Svalbard (latitude 72°–84°) to avoid inconvenient zone boundaries over land.

Question 6

What input formats are accepted?

Accepted Answer

You can type decimal degrees (48.8584), DMS with symbols (48° 51' 30.24" N), DMS with spaces (48 51 30.24 N), or DDM (48° 51.504' N). Negative numbers are accepted for South/West without direction letters. The parser auto-detects the format.

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