Obstacle.md

@@ -61,6 +61,7 @@ An `Obs` obstacle is an individual object described as cylindrical volume with c
   </ObsUid>
   <txtName>DROITWICH LW NORTH</txtName>
   <codeType>ANTENNA</codeType>
+  <codeGroup>Y</codeGroup>
   <codeLgt>Y</codeLgt>
   <codeMarking>Y</codeMarking>
   <txtDescrLgt>Red lighting</txtDescrLgt>
@@ -89,6 +90,7 @@ An `Obs` obstacle is an individual object described as cylindrical volume with c
   </ObsUid>
   <txtName>DROITWICH LW SOUTH</txtName>
   <codeType>ANTENNA</codeType>
+  <codeGroup>Y</codeGroup>
   <codeLgt>Y</codeLgt>
   <codeMarking>Y</codeMarking>
   <txtDescrLgt>Red lighting</txtDescrLgt>
@@ -124,6 +126,7 @@ An `Obs` obstacle is an individual object described as cylindrical volume with c
   * `geoLong` ![[M]](https://openflightmaps.github.io/ofmx/svg/m.svg) – Location [[longitude|Coordinates]]
 * `txtName` – Name of the obstacle
 * `codeType` ![[M]](https://openflightmaps.github.io/ofmx/svg/m.svg) ![[X]](https://openflightmaps.github.io/ofmx/svg/x.svg) – `ANTENNA`, `BUILDING`, `CHIMNEY`, `CRANE`, `MAST`, `TOWER`, `TREE`, `WINDTURBINE` *or* `OTHER` (see remarks)
+* `codeGroup` – `Y` (yes, obstacle is member of a group) *or* `N` (no, obstacle is not member of a group)
 * `codeLgt` – `Y` (yes, obstacle is lighted), `N` (no, obstacle is not lighted) *or* omit the tag if unknown
 * `codeMarking` ![[X]](https://openflightmaps.github.io/ofmx/svg/x.svg) – `Y` (yes, obstacle has markings), `N` (no, obstacle has no markings) *or* omit the tag if unknown
 * `txtDescrLgt` ![[MD]](https://openflightmaps.github.io/ofmx/svg/md.svg) – Description of the lighting (e.g. color)