diff --git a/eos/effects/basemaxscandeviationmodifiermoduleonline2none.py b/eos/effects/basemaxscandeviationmodifiermoduleonline2none.py
index 80d6542e7..c1d587982 100644
--- a/eos/effects/basemaxscandeviationmodifiermoduleonline2none.py
+++ b/eos/effects/basemaxscandeviationmodifiermoduleonline2none.py
@@ -3,4 +3,5 @@
 type = "passive"
 def handler(fit, module, context):
     fit.modules.filteredChargeBoost(lambda mod: mod.charge.requiresSkill("Astrometrics"),
-                                    "baseMaxScanDeviation", module.getModifiedItemAttr("maxScanDeviationModifierModule"))
+                                    "baseMaxScanDeviation", module.getModifiedItemAttr("maxScanDeviationModifierModule"),
+                                    stackingPenalties=True)
diff --git a/eos/effects/basesensorstrengthmodifiermodule.py b/eos/effects/basesensorstrengthmodifiermodule.py
index 44203a325..c48db01cd 100644
--- a/eos/effects/basesensorstrengthmodifiermodule.py
+++ b/eos/effects/basesensorstrengthmodifiermodule.py
@@ -3,4 +3,5 @@
 type = "passive"
 def handler(fit, module, context):
     fit.modules.filteredChargeBoost(lambda mod: mod.charge.requiresSkill("Astrometrics"),
-                                    "baseSensorStrength", module.getModifiedItemAttr("scanStrengthBonusModule"))
+                                    "baseSensorStrength", module.getModifiedItemAttr("scanStrengthBonusModule"),
+                                    stackingPenalties=True)
diff --git a/eos/effects/basesensorstrengthmodifierrequiringastrometrics.py b/eos/effects/basesensorstrengthmodifierrequiringastrometrics.py
index ae7d169df..573ab896e 100755
--- a/eos/effects/basesensorstrengthmodifierrequiringastrometrics.py
+++ b/eos/effects/basesensorstrengthmodifierrequiringastrometrics.py
@@ -8,5 +8,7 @@
 type = "passive"
 def handler(fit, container, context):
     level = container.level if "skill" in context else 1
+    penalized = False if "skill" in context or "implant" in context else True
     fit.modules.filteredChargeBoost(lambda mod: mod.charge.requiresSkill("Astrometrics"),
-                                    "baseSensorStrength", container.getModifiedItemAttr("scanStrengthBonus") * level)
+                                    "baseSensorStrength", container.getModifiedItemAttr("scanStrengthBonus") * level,
+                                    stackingPenalties=penalized)