HQtype is a combined field, consisting of the HQ type and its command radius.

------------
The last digit of the HQ type => command radius
Take the HQ type and divide by 10 => actual type as defined below
0 = Corps HQ (range of editor value: 01-09)
2 = Naval HQ (21-29)
3 = Amphibious HQ (31-39)
5 = Air HQ (51-59)
7 = Army HQ (71-79)
10 = Command HQ (101-109)

Details can be found in Editor Manual under Location tab.