[Jimbuna]

The convoy is designated by the lead ship but does not automatically mean everything else in the convoy is the same.

If the lead vessel had of been a submarine (nad yes, some do exist in GWX) the the square or diamond shape would be 'round/circular' but obviously the other elements of the convoy would more than likely be ships.

Conversely, the lead ship that was coloured red on the map wouldn't automatically mean everything else in the convoy was an enemy....ther might also be a submarine and or a few neutrals.

Hope this helps clarify a few points.