By default, Map Source uses the units that could be different with your country. But we can easily change the units in Map Source easily. I am using the most recent version of Map Source 6.11 on this tutorial. To change Units in Map Source 6.11, you can do the following.
Open Map Source and then go to Edit | Preferences. Now click Units tab and you can change the units to match with your country
Once you change the units, simply press OK. Done.