#### Square references

A square reference consists of at least a brigram for large squares and additionally a
number of up to four digits depicting a sub square.

The input format is not case sensitive and may contain spaces.

Examples: `BF`

`ÄE 1`

`AK 02`

`bh1361`

#### Coordinates

Coordinates consist of a latitude as the first component and longitude as the second. The
components need to be separated by a comma (`,`

).

Coordinates may be entered in any of the official formats:

- Degree/Minute/Second:
`52°26'23"N, 013°30'19"W`

- Degree/Decimal Minute:
`52°26.383'N, 013°30.317'W`

- Decimal Degree:
`52.43972, -13.50528`

Directions can be either entered as compass points (`N`

`E`

`S`

`W`

or `O`

for German "Ost") or as a leading
sign (`+`

/`-`

). If neither is entered, a `+`

leading sign will be assumed.

Any special characters (`°`

`'`

`"`

) may be
replaced by non-numerical characters like blanks, hyphens, letters or any other
character, that is not a digit. The official symbols for arcminute (`′`

)
and arcsecond (`″`

) are unfortunately not yet supported and will render
the coordinate impossible to parse.

Examples:

`52°26'23"N, 013°30'19"W`

`52°26'23''N, 013°30'19''W`

`52 26 23 N, 013 30 19 W`

`52-26-23N, 013/30/19W`

`52d26m23sN, 013'30'19'W`

`52 26 23, -013 30 19`

`52°26.383'N, 013°30.317'W`

`52 26.383N, 013 30.317 W`

`52.43972, -13.50528`