some hints

code/datums/components/gps.dm

@@ -44,6 +44,7 @@ GLOBAL_LIST_EMPTY(GPS_list)
 		RegisterSignal(parent, COMSIG_ATOM_EMP_ACT, .proc/on_emp_act)
 	RegisterSignal(parent, COMSIG_PARENT_EXAMINE, .proc/on_examine)
 	RegisterSignal(parent, COMSIG_CLICK_ALT, .proc/on_AltClick)
+	RegisterSignal(parent, COMSIG_ATOM_REQUESTING_CONTEXT_FROM_ITEM, .proc/on_requesting_context_from_item)
 
 ///Called on COMSIG_ITEM_ATTACK_SELF
 /datum/component/gps/item/proc/interact(datum/source, mob/user)
@@ -54,6 +55,17 @@ GLOBAL_LIST_EMPTY(GPS_list)
 /datum/component/gps/item/proc/on_examine(datum/source, mob/user, list/examine_list)
 	examine_list += "<span class='notice'>Alt-click to switch it [tracking ? "off":"on"].</span>"
 
+/datum/component/gps/item/proc/on_requesting_context_from_item(
+	obj/source,
+	list/context,
+	obj/item/held_item,
+	mob/living/user,
+)
+	SIGNAL_HANDLER
+
+	LAZYSET(context[SCREENTIP_CONTEXT_ALT_LMB], INTENT_ANY, tracking ? "Turn off" : "Turn on")
+	return CONTEXTUAL_SCREENTIP_SET
+
 ///Called on COMSIG_ATOM_EMP_ACT
 /datum/component/gps/item/proc/on_emp_act(datum/source, severity)
 	emped = TRUE