Index: binaries/data/mods/public/gui/common/gamedescription.js
===================================================================
--- binaries/data/mods/public/gui/common/gamedescription.js
+++ binaries/data/mods/public/gui/common/gamedescription.js
@@ -396,6 +396,11 @@
 		"value": initAttributes.settings.RevealMap
 	});
 
+	titles.push({
+		"label": translate("Allied View"),
+		"value": initAttributes.settings.AllyView
+	});
+
 	titles.push({
 		"label": translate("Cheats"),
 		"value": initAttributes.settings.CheatsEnabled
Index: binaries/data/mods/public/gui/credits/texts/programming.json
===================================================================
--- binaries/data/mods/public/gui/credits/texts/programming.json
+++ binaries/data/mods/public/gui/credits/texts/programming.json
@@ -125,6 +125,7 @@
 				{ "nick": "Itms", "name": "Nicolas Auvray" },
 				{ "nick": "Jaison", "name": "Marco tom Suden" },
 				{ "nick": "jammus", "name": "James Scott" },
+				{ "nick": "Jammyjamjamman", "name": "James Sherratt" },
 				{ "nick": "Janwas", "name": "Jan Wassenberg" },
 				{ "nick": "javiergodas", "name": "Javier Godas Vieitez" },
 				{ "nick": "JCWasmx86" },
Index: binaries/data/mods/public/gui/gamesettings/attributes/MapExploration.js
===================================================================
--- binaries/data/mods/public/gui/gamesettings/attributes/MapExploration.js
+++ binaries/data/mods/public/gui/gamesettings/attributes/MapExploration.js
@@ -4,6 +4,7 @@
 	{
 		this.explored = false;
 		this.revealed = false;
+		this.allied = false;
 
 		this.settings.map.watch(() => this.onMapChange(), ["map"]);
 	}
@@ -12,12 +13,14 @@
 	{
 		attribs.settings.RevealMap = this.revealed;
 		attribs.settings.ExploreMap = this.explored;
+		attribs.settings.AllyView = this.allied;
 	}
 
 	fromInitAttributes(attribs)
 	{
 		this.explored = !!this.getLegacySetting(attribs, "ExploreMap");
 		this.revealed = !!this.getLegacySetting(attribs, "RevealMap");
+		this.allied = !!this.getLegacySetting(attribs, "AllyView");
 	}
 
 	onMapChange(mapData)
@@ -26,6 +29,7 @@
 			return;
 		this.setExplored(this.getMapSetting("ExploreMap"));
 		this.setRevealed(this.getMapSetting("RevealMap"));
+		this.setRevealed(this.getMapSetting("AllyView"));
 	}
 
 	setExplored(enabled)
@@ -38,5 +42,12 @@
 	{
 		this.explored = this.explored || enabled;
 		this.revealed = enabled;
+		this.allied = this.allied || enabled;
+	}
+
+	setAllied(enabled)
+	{
+		this.allied = enabled;
+		this.revealed = this.revealed && this.allied;
 	}
 };
Index: binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/GameSettingsLayout.js
===================================================================
--- binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/GameSettingsLayout.js
+++ binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/GameSettingsLayout.js
@@ -20,7 +20,8 @@
 			"Nomad",
 			"Treasures",
 			"ExploredMap",
-			"RevealedMap"
+			"RevealedMap",
+			"AlliedView"
 		]
 	},
 	{
Index: binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/Single/Checkboxes/AlliedView.js
===================================================================
--- /dev/null
+++ binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/GameSettings/Single/Checkboxes/AlliedView.js
@@ -0,0 +1,28 @@
+GameSettingControls.AlliedView = class AlliedView extends GameSettingControlCheckbox
+{
+	constructor(...args)
+	{
+		super(...args);
+		g_GameSettings.mapExploration.watch(() => this.render(), ["allied"]);
+		g_GameSettings.map.watch(() => this.render(), ["type"]);
+		this.render();
+	}
+
+	render()
+	{
+		this.setEnabled(g_GameSettings.map.type != "scenario");
+		this.setChecked(g_GameSettings.mapExploration.allied);
+	}
+
+	onPress(checked)
+	{
+		g_GameSettings.mapExploration.setAllied(checked);
+		this.gameSettingsController.setNetworkInitAttributes();
+	}
+};
+
+GameSettingControls.AlliedView.prototype.TitleCaption =
+	translate("Allied View");
+
+GameSettingControls.AlliedView.prototype.Tooltip =
+	translate("Toggle allied view (see what your allies see).");
Index: binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/GameDescription.js
===================================================================
--- binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/GameDescription.js
+++ binaries/data/mods/public/gui/gamesetup/Pages/GameSetupPage/Panels/GameDescription.js
@@ -23,6 +23,7 @@
 		g_GameSettings.map.watch(update, ["map", "type"]);
 		g_GameSettings.mapExploration.watch(update, ["explored"]);
 		g_GameSettings.mapExploration.watch(update, ["revealed"]);
+		g_GameSettings.mapExploration.watch(update, ["allied"]);
 		g_GameSettings.nomad.watch(update, ["enabled"]);
 		g_GameSettings.population.watch(update, ["perPlayer", "cap", "useWorldPop"]);
 		g_GameSettings.rating.watch(update, ["enabled"]);
Index: binaries/data/mods/public/l10n/en_GB.public-gui-gamesetup.po
===================================================================
--- binaries/data/mods/public/l10n/en_GB.public-gui-gamesetup.po
+++ binaries/data/mods/public/l10n/en_GB.public-gui-gamesetup.po
@@ -236,6 +236,18 @@
 msgid "Toggle explored map (see initial map)."
 msgstr "Toggle explored map (see initial map)."
 
+#. Translation: Make sure to differentiate between the revealed map and
+#. ally view settings!
+#: gui/gamesetup/Pages/GameSetupPage/GameSettings/Single/Checkboxes/AlliedView.js:25
+msgid "Ally View"
+msgstr "Ally View"
+
+#. Translation: Make sure to differentiate between the revealed map and
+#. ally view settings!
+#: gui/gamesetup/Pages/GameSetupPage/GameSettings/Single/Checkboxes/AlliedView.js:28
+msgid "Toggle allied view (see everything you + allies can see)."
+msgstr "Toggle allied view (see everything you + allies can see)."
+
 #: gui/gamesetup/Pages/GameSetupPage/GameSettings/Single/Checkboxes/LastManStanding.js:26
 msgid "Last Man Standing"
 msgstr "Last Man Standing"
Index: binaries/data/mods/public/simulation/helpers/InitGame.js
===================================================================
--- binaries/data/mods/public/simulation/helpers/InitGame.js
+++ binaries/data/mods/public/simulation/helpers/InitGame.js
@@ -41,6 +41,20 @@
 			cmpRangeManager.ExploreMap(i);
 	}
 
+	if (settings.AllyView)
+	{
+		for (let i = 1; i < settings.PlayerData.length; ++i)
+		{
+			let cmpPlayer = QueryPlayerIDInterface(i);
+			let cmpTechnologyManager = Engine.QueryInterface(cmpPlayer.entity, IID_TechnologyManager);
+			if (cmpTechnologyManager)
+			{
+				cmpTechnologyManager.ResearchTechnology(cmpPlayer.template.SharedLosTech);
+				cmpPlayer.UpdateSharedLos();
+			}
+		}
+	}
+
 	// Sandbox, Very Easy, Easy, Medium, Hard, Very Hard
 	// rate apply on resource stockpiling as gathering and trading
 	// time apply on building, upgrading, packing, training and technologies