Declination units wrong in Elements.py
The endpoint https://geomag.usgs.gov/ws/elements/ reports units of "dam" or "deci-arcminutes". This is wrong.
This should be changed in Elements.py so that:
"properties": {
"name": "Declination (arcminutes)",
"units": "amin"
},The units could also be "'" (single tick mark), but I think that would be confusing to many users.