Function getDefaultDistanceUnit

getDefaultDistanceUnit(): JMAP_DISTANCE_UNITS
JMap.Project.getDefaultDistanceUnit

Returns the project distance unit, or "meters" if no distance unit is set on the project.

Returns JMAP_DISTANCE_UNITS
Throws
if no project is loaded

Example
```
// returns "meters", or "kilometers", or "miles", or "yards"...
JMap.Project.getDefaultDistanceUnit()
```