diff --git a/.tool-versions b/.tool-versions
index ff3098f..44cbbf7 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 erlang 28.5
-elixir 1.19.5-otp-28
+elixir 1.20.0-rc.6-otp-28
 #elixir 1.20.0-rc.1-otp-28
diff --git a/lib/aprsme/encoding.ex b/lib/aprsme/encoding.ex
index d6cbaa0..7c4896e 100644
--- a/lib/aprsme/encoding.ex
+++ b/lib/aprsme/encoding.ex
@@ -220,7 +220,7 @@ defmodule Aprsme.Encoding do
 
   @spec valid_utf8_continuation?(binary(), non_neg_integer()) :: boolean()
   defp valid_utf8_continuation?(binary, pos) do
-    <<_::binary-size(pos), _char::utf8, _::binary>> = binary
+    <<_::binary-size(^pos), _char::utf8, _::binary>> = binary
     true
   rescue
     _ -> false
diff --git a/lib/aprsme/regex_cache.ex b/lib/aprsme/regex_cache.ex
index 2e1bfcc..54fe688 100644
--- a/lib/aprsme/regex_cache.ex
+++ b/lib/aprsme/regex_cache.ex
@@ -10,8 +10,6 @@ defmodule Aprsme.RegexCache do
 
   use GenServer
 
-  require Logger
-
   @table_name :regex_cache
   @max_cache_size 1000
   # When the cache is full, drop this fraction of least-recently-used entries.
diff --git a/lib/aprsme/spatial_pubsub.ex b/lib/aprsme/spatial_pubsub.ex
index 223abe3..d6f9274 100644
--- a/lib/aprsme/spatial_pubsub.ex
+++ b/lib/aprsme/spatial_pubsub.ex
@@ -5,8 +5,6 @@ defmodule Aprsme.SpatialPubSub do
   """
   use GenServer
 
-  require Logger
-
   # Grid size in degrees for spatial indexing
   @grid_size 1.0
   # Maximum number of concurrent clients
diff --git a/lib/aprsme/streaming_packets_pubsub.ex b/lib/aprsme/streaming_packets_pubsub.ex
index 9913c49..6e66b58 100644
--- a/lib/aprsme/streaming_packets_pubsub.ex
+++ b/lib/aprsme/streaming_packets_pubsub.ex
@@ -8,8 +8,6 @@ defmodule Aprsme.StreamingPacketsPubSub do
 
   use GenServer
 
-  require Logger
-
   @table_name :streaming_packets_subscribers
 
   # Client API
diff --git a/lib/aprsme_web/controllers/api/v1/fallback_controller.ex b/lib/aprsme_web/controllers/api/v1/fallback_controller.ex
index af014a6..269c2d6 100644
--- a/lib/aprsme_web/controllers/api/v1/fallback_controller.ex
+++ b/lib/aprsme_web/controllers/api/v1/fallback_controller.ex
@@ -73,7 +73,6 @@ defmodule AprsmeWeb.Api.V1.FallbackController do
     |> render(:"500")
   end
 
-  defp format_error_message(:not_found), do: gettext("Resource not found")
   defp format_error_message(:unauthorized), do: gettext("Unauthorized access")
   defp format_error_message(:forbidden), do: gettext("Access forbidden")
   defp format_error_message(:bad_request), do: gettext("Bad request")
diff --git a/lib/aprsme_web/live/info_live/show.html.heex b/lib/aprsme_web/live/info_live/show.html.heex
index 865ae74..2bf0085 100644
--- a/lib/aprsme_web/live/info_live/show.html.heex
+++ b/lib/aprsme_web/live/info_live/show.html.heex
@@ -187,7 +187,7 @@
         </div>
         
 <!-- Map showing station location -->
-        <%= if @packet && @packet.lat && @packet.lon do %>
+        <%= if @packet.lat && @packet.lon do %>
           <div class="bg-white shadow-xs sm:rounded-lg ring-1 ring-gray-950/5 dark:bg-gray-800/50 dark:shadow-none dark:ring-white/10 h-full">
             <% {symbol_table, symbol_code} = AprsmeWeb.AprsSymbol.extract_from_packet(@packet) %>
             <% symbol_html = AprsmeWeb.AprsSymbol.render_marker_html(symbol_table, symbol_code, @callsign, 32) %>
diff --git a/lib/aprsme_web/live/map_live/packet_batcher.ex b/lib/aprsme_web/live/map_live/packet_batcher.ex
index f8aa71b..7ee45fa 100644
--- a/lib/aprsme_web/live/map_live/packet_batcher.ex
+++ b/lib/aprsme_web/live/map_live/packet_batcher.ex
@@ -6,8 +6,6 @@ defmodule AprsmeWeb.MapLive.PacketBatcher do
 
   use GenServer
 
-  require Logger
-
   @batch_size 10
   # milliseconds
   @batch_timeout 100
diff --git a/lib/aprsme_web/live/shared/param_utils.ex b/lib/aprsme_web/live/shared/param_utils.ex
index e9946c2..45ac3ea 100644
--- a/lib/aprsme_web/live/shared/param_utils.ex
+++ b/lib/aprsme_web/live/shared/param_utils.ex
@@ -98,12 +98,8 @@ defmodule AprsmeWeb.Live.Shared.ParamUtils do
     end
   end
 
-  def safe_parse_coordinate(value, default, min, max) when is_number(value) do
-    if finite_number?(value) do
-      clamp_coordinate(value, min, max)
-    else
-      default
-    end
+  def safe_parse_coordinate(value, _default, min, max) when is_number(value) do
+    clamp_coordinate(value, min, max)
   end
 
   def safe_parse_coordinate(_, default, _, _), do: default
diff --git a/lib/aprsme_web/live/weather_live/callsign_view.ex b/lib/aprsme_web/live/weather_live/callsign_view.ex
index 85941c2..a468e89 100644
--- a/lib/aprsme_web/live/weather_live/callsign_view.ex
+++ b/lib/aprsme_web/live/weather_live/callsign_view.ex
@@ -231,7 +231,6 @@ defmodule AprsmeWeb.WeatherLive.CallsignView do
     case value do
       "N/A" -> false
       "" -> false
-      nil -> false
       _ -> true
     end
   end
diff --git a/lib/aprsme_web/plugs/health_check.ex b/lib/aprsme_web/plugs/health_check.ex
index 791438d..a1b24a9 100644
--- a/lib/aprsme_web/plugs/health_check.ex
+++ b/lib/aprsme_web/plugs/health_check.ex
@@ -8,8 +8,6 @@ defmodule AprsmeWeb.Plugs.HealthCheck do
 
   alias Ecto.Adapters.SQL
 
-  require Logger
-
   def init(opts), do: opts
 
   def call(%{request_path: "/health"} = conn, opts) do
diff --git a/lib/aprsme_web/plugs/remote_ip.ex b/lib/aprsme_web/plugs/remote_ip.ex
index 60a8ee2..41cada2 100644
--- a/lib/aprsme_web/plugs/remote_ip.ex
+++ b/lib/aprsme_web/plugs/remote_ip.ex
@@ -11,8 +11,6 @@ defmodule AprsmeWeb.Plugs.RemoteIp do
 
   import Plug.Conn
 
-  require Logger
-
   @impl true
   def init(opts), do: opts