Change behavior when using 2 UI dependent modsuit modules.

code/modules/mod/modules/modules_medical.dm

@@ -115,19 +115,22 @@
 	toolspeed = 2
 	defib_cooldown = 2.5 SECONDS
 
-///Crew Monitor - Deploys or retracts a built-in handheld crew monitor
 /obj/item/mod/module/monitor
 	name = "MOD crew monitor module"
 	desc = "A module installed into the wrist of the suit, this presents a display of crew sensor data."
 	icon_state = "scanner"
-	module_type = MODULE_ACTIVE
+	module_type = MODULE_USABLE
 	complexity = 1
-	active_power_cost = DEFAULT_CHARGE_DRAIN * 0.3
-	device = /obj/item/sensor_device/mod
+	use_power_cost = DEFAULT_CHARGE_DRAIN * 0.3
 	incompatible_modules = list(/obj/item/mod/module/monitor)
 	cooldown_time = 0.5 SECONDS
+	allow_flags = MODULE_ALLOW_INACTIVE
+	var/datum/ui_module/crew_monitor/mod/crew_monitor
 
-/obj/item/sensor_device/mod
-	name = "MOD crew monitor"
-	desc = "A miniature machine built into a modsuit that tracks suit sensors across the station."
-	flags = NODROP
+
+/obj/item/mod/module/monitor/Initialize(mapload)
+	. = ..()
+	crew_monitor = new(src)
+
+/obj/item/mod/module/monitor/on_use()
+	crew_monitor.ui_interact(mod.wearer)

code/modules/mod/modules/modules_supply.dm

@@ -7,12 +7,20 @@
 		down to the exact coordinates. This information is fed to a central database viewable from the device itself, \
 		though using it to help people is up to you."
 	icon_state = "gps"
-	module_type = MODULE_ACTIVE
+	module_type = MODULE_USABLE
 	complexity = 1
 	use_power_cost = DEFAULT_CHARGE_DRAIN * 0.2
 	incompatible_modules = list(/obj/item/mod/module/gps)
 	cooldown_time = 0.5 SECONDS
-	device = /obj/item/gps/mod
+	allow_flags = MODULE_ALLOW_INACTIVE
+	var/obj/item/gps/mod/gps
+
+/obj/item/mod/module/gps/Initialize(mapload)
+	. = ..()
+	gps = new(src)
+
+/obj/item/mod/module/gps/on_use()
+	gps.attack_self__legacy__attackchain(mod.wearer)
 
 ///Hydraulic Clamp - Lets you pick up and drop crates.
 /obj/item/mod/module/clamp

code/modules/telesci/gps.dm

@@ -62,8 +62,8 @@ GLOBAL_LIST_EMPTY(GPS_list)
 	update_icon(UPDATE_OVERLAYS)
 	addtimer(CALLBACK(src, PROC_REF(reboot)), EMP_DISABLE_TIME)
 
-/obj/item/gps/AltClick(mob/user)
-	if(ui_status(user, GLOB.inventory_state) != UI_INTERACTIVE)
+/obj/item/gps/AltClick(mob/user, state)
+	if(ui_status(user, state) != UI_INTERACTIVE)
 		return //user not valid to use gps
 	if(emped)
 		to_chat(user, "<span class='warning'>It's busted!</span>")
@@ -130,7 +130,7 @@ GLOBAL_LIST_EMPTY(GPS_list)
 		ui = new(user, src, "GPS", "GPS")
 		ui.open()
 
-/obj/item/gps/ui_act(action, list/params)
+/obj/item/gps/ui_act(action, list/params, datum/tgui/ui, datum/ui_state/state)
 	if(..())
 		return
 
@@ -144,7 +144,7 @@ GLOBAL_LIST_EMPTY(GPS_list)
 			gpstag = newtag
 			name = "global positioning system ([gpstag])"
 		if("toggle")
-			AltClick(usr)
+			AltClick(usr, state)
 			return FALSE
 		if("same_z")
 			same_z = !same_z
@@ -181,7 +181,10 @@ GLOBAL_LIST_EMPTY(GPS_list)
 	icon_state = "gps-m"
 	gpstag = "MOD0"
 	desc = "A positioning system helpful for rescuing trapped or injured miners, after you have become lost from rolling around at the speed of sound."
-	flags = NODROP
+	tracking = FALSE
+
+/obj/item/gps/mod/ui_state()
+	return GLOB.deep_inventory_state
 
 /obj/item/gps/cyborg
 	icon_state = "gps-b"

code/modules/tgui/modules/crew_monitor.dm

@@ -124,6 +124,12 @@
 
 	return data
 
+/datum/ui_module/crew_monitor/mod
+	name = "Crew monitor (Modsuit)"
+
+/datum/ui_module/crew_monitor/mod/ui_state(mob/user)
+	return GLOB.deep_inventory_state
+
 /datum/ui_module/crew_monitor/ghost
 	name = "Crew monitor (Observer)"
 	is_advanced = TRUE