diff --git a/Makefile b/Makefile
index d0583f425..396f18b05 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ yaml:
 	${TOOLSDIR}/vspec2yaml.py -I ./spec -o overlays/DIMO/dimo.vspec --uuid -u ./spec/units.yaml ./spec/VehicleSignalSpecification.vspec vss_rel_$(VSS_VERSION).yaml
 
 csv:
-	${TOOLSDIR}/vspec2csv.py -I ./spec -o overlays/DIMO/dimo.vspec --uuid -u ./spec/units.yaml ./spec/VehicleSignalSpecification.vspec vss_rel_$(VSS_VERSION).csv
+	${TOOLSDIR}/vspec2csv.py -I ./spec -vt overlays/DIMO/types.vspec -o overlays/DIMO/dimo.vspec --uuid -u ./spec/units.yaml ./spec/VehicleSignalSpecification.vspec vss_rel_$(VSS_VERSION).csv
 
 ddsidl:
 	${TOOLSDIR}/vspec2ddsidl.py -I ./spec -o overlays/DIMO/dimo.vspec --uuid -u ./spec/units.yaml ./spec/VehicleSignalSpecification.vspec vss_rel_$(VSS_VERSION).idl
diff --git a/overlays/DIMO/dimo.vspec b/overlays/DIMO/dimo.vspec
index 7e1ec618e..7df1b4e29 100644
--- a/overlays/DIMO/dimo.vspec
+++ b/overlays/DIMO/dimo.vspec
@@ -15,6 +15,10 @@ Vehicle.DIMO.Aftermarket:
   description: holds information about the aftermarket dimo device
 #include aftermarket.vspec Vehicle.DIMO.Aftermarket
 
+Vehicle.CurrentLocation.Coordinates:
+  type: sensor
+  datatype: Types.DIMO.Coordinates
+  description: Current location of the vehicle in WGS 84 coordinates.
 
 Vehicle.DIMO.Subject:
   type: sensor
diff --git a/overlays/DIMO/types.vspec b/overlays/DIMO/types.vspec
new file mode 100644
index 000000000..f84add234
--- /dev/null
+++ b/overlays/DIMO/types.vspec
@@ -0,0 +1,34 @@
+Types:
+  type: branch
+  description: Type definitions
+
+Types.DIMO:
+  type: branch
+  description: DIMO-specific types
+
+Types.DIMO.Coordinates:
+  type: struct
+  description: A struct datatype representing GNSS position.
+
+Types.DIMO.Coordinates.Latitude:
+  datatype: double
+  type: property
+  min: -90
+  max: 90
+  unit: degrees
+  description: Latitude in WGS 84 coordinates.
+
+Types.DIMO.Coordinates.Longitude:
+  datatype: double
+  type: property
+  min: -180
+  max: 180
+  unit: degrees
+  description: Longitude in WGS 84 coordinates.
+
+Types.DIMO.Coordinates.HDOP:
+  datatype: double
+  type: property
+  min: 0
+  unit: ratio
+  description: Horizontal dilution of position. May be zero if this was not measured.