Should be showing the ghost ship now.

Might have broken ghost ships as the stop observe button causes a runtime error for them.

nsv13.dme

@@ -3845,7 +3845,9 @@
 #include "nsv13\code\modules\antagonists\simple_teamchat.dm"
 #include "nsv13\code\modules\antagonists\boarders\boarders.dm"
 #include "nsv13\code\modules\antagonists\boarders\pirate_boarders.dm"
+#include "nsv13\code\modules\antagonists\ghostship\ghost_ship.dm"
 #include "nsv13\code\modules\antagonists\role_preference\role_antagonists.dm"
+#include "nsv13\code\modules\antagonists\role_preference\role_midrounds.dm"
 #include "nsv13\code\modules\atmospherics\gasmixtures\reactions.dm"
 #include "nsv13\code\modules\atmospherics\machinery\components\binary_devices\constrictor.dm"
 #include "nsv13\code\modules\atmospherics\machinery\components\unary_devices\tank.dm"

nsv13/code/controllers/subsystem/overmap_mode.dm

@@ -649,7 +649,7 @@ SUBSYSTEM_DEF(overmap_mode)
 				if("Cancel")
 					return
 				if("Open")
-					var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [initial(target_ship.faction)] [initial(target_ship.name)]?", ROLE_GHOSTSHIP, null, null, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
+					var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [initial(target_ship.faction)] [initial(target_ship.name)]?", ROLE_GHOSTSHIP, /datum/role_preference/midround_ghost/ghost_ship, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
 					if(LAZYLEN(candidates))
 						var/mob/dead/observer/C = pick(candidates)
 						target_ghost = C

nsv13/code/modules/antagonists/ghostship/ghost_ship.dm

@@ -0,0 +1,8 @@
+/datum/antagonist/ghost_ship
+	name = "Ghost Ship"
+	show_name_in_check_antagonists = TRUE
+	show_in_antagpanel = FALSE
+	show_in_roundend = FALSE
+	banning_key = ROLE_GHOSTSHIP
+
+///Used for tracking and because the role_preferences needs an antag_datum to point at.

nsv13/code/modules/antagonists/role_preference/role_midrounds.dm

@@ -0,0 +1,3 @@
+/datum/role_preference/midround_ghost/ghost_ship
+	name = "Ghost Ship"
+	antag_datum = /datum/antagonist/ghost_ship

nsv13/code/modules/overmap/ai-skynet.dm

@@ -716,7 +716,7 @@ Adding tasks is easy! Just define a datum for it.
 			var/target_location = locate(rand(round(world.maxx/2) + 10, world.maxx - 39), rand(40, world.maxy - 39), OM.z)
 			var/obj/structure/overmap/selected_ship = pick(ship_list)
 			var/target_ghost
-			var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [initial(selected_ship.faction)] [initial(selected_ship.name)]?", ROLE_GHOSTSHIP, null, null, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
+			var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [initial(selected_ship.faction)] [initial(selected_ship.name)]?", ROLE_GHOSTSHIP, /datum/role_preference/midround_ghost/ghost_ship, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
 			if(LAZYLEN(candidates))
 				var/mob/dead/observer/C = pick(candidates)
 				target_ghost = C

nsv13/code/modules/overmap/overmap_ghosts.dm

@@ -16,7 +16,7 @@
 			if("Cancel")
 				return
 			if("Open")
-				var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [src.faction] [src.name]?", ROLE_GHOSTSHIP, null, null, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
+				var/list/mob/dead/observer/candidates = pollGhostCandidates("Do you wish to pilot a [src.faction] [src.name]?", ROLE_GHOSTSHIP, /datum/role_preference/midround_ghost/ghost_ship, 20 SECONDS, POLL_IGNORE_GHOSTSHIP)
 				if(LAZYLEN(candidates))
 					var/mob/dead/observer/C = pick(candidates)
 					target_ghost = C
@@ -79,6 +79,10 @@
 	ghost.hud_type = /datum/hud //Mostly blank hud
 	ghost.key = target.key
 
+	//More or less a modified version of how the morph antag gets the antag datum.
+	if(ghost.mind)
+		ghost.mind.add_antag_datum(/datum/antagonist/ghost_ship)
+
 	//Allows player to hear hails
 	mobs_in_ship += ghost