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Old 12-20-10, 11:40 AM   #2
Jimbuna
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Your correct...the circle informs you the lead element of the convoy is a submarine but not necessarily all of it.

If the lead element had been a ship the screen would have shown a squre or a diamond but there may still have been a submarine within its ranks.

In other words...it is the type of vessel that is the lead element that dictates the shape on view.
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