lat or long in minutes

[rweigel]

Some magnetometer data uses declination with units of minutes. In
https://github.com/hapi-server/data-specification/blob/master/hapi-dev/HAPI-data-access-spec-dev.md#3611-vectorcomponents-object
we only state degrees or radians.

[jvandegriff]

Can you give an example showing the values and how they are represented?

If it is a single string, we can add a new allowed unit type.

If it is complicated and needs parsing, then one option would be to document that servers need to convert to one of the units we already have.

[rweigel]

Declination angles in INTERMAGNET are given in fractional minutes.

We could also support fractional seconds.

Probably that is all we'll want to support.

I don't think we should handle, e.g., 20° 15' 30" as it has mixed units.