diff --git a/CLAUDE.md b/CLAUDE.md
index 2328332..cdd9c0a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -23,7 +23,7 @@ Location is 48.72° N Latitude and -122.51° W Longitude
 The proposed maximum range is 15 miles. 
 Selectable ranges sould be 2, 5, 10, and 15 miles
 
-The project will be implimented on on a Geekom A8 Max
+The project will be implemented on on a Geekom A8 Max
 with AMD AI chip R9-8945HS with 32 GB ram
 
 The operating system is Linux (Ubuntu)
@@ -91,6 +91,12 @@ running linux.
 I plan to have a variety of phony targets simulated in addition to
 those received on uat, ads-b, and ais. 
 
+Note that directions shall be true, not magnetic
+
+Note that shoreline data is from noaa maps
+(NOAA provides free ENC (Electronic Nautical Chart) data in S-57 format covering   
+  Bellingham Bay and surrounding waters.)
+
 I prefer to have separate shader sets for each major function to facilitate
 troubleshootng
 Major functions:
@@ -109,7 +115,7 @@ Display colors:
 2. A Scope graticule is incandescent color
 3. PPI scope active targets including scatters, graticule range rings, shoreline,
    all p7 phosphor (active white blue)
-4. All persistance for  PPI scope active targets including 
+4. All persistance (also p7 greenish yellow persistance) for  PPI scope active targets including 
    scatters, graticule range rings, shoreline
 5. PPI scope bearing ring and ticks is incandescent color.
 
@@ -129,6 +135,8 @@ Need to have following fixed singnal strength:
 2. yachts would be bright but not blooming
 3. sailboats would be medium bright and not blooming
 4. kayaks and roaboats would be small and dim
+5. May consider fading small boats like kayaks
+   and sail bots above 3 miles
 
 Details of each feature:
 
@@ -144,6 +152,10 @@ A scope:
    scope and inserts the replacement through the same slot. All these graticules
    are lighted with incandescent colors.
 
+Note on screen update vs pulse repition frequency. We need to be careful
+since we have no control of the display update frequency and need
+to do whatever is needed to reduce aliasing or flickering
+
 PPI Scope active targets
 1. Active boats/planes; brightness determined by size as noted above
 2. Blue white color
@@ -171,17 +183,17 @@ Here are the controls that I am proposing
 
 1. Intensity
 2. Focus
-3. Astignatism
+3. astigmatism
 4. Range selection (for both a scope and ppi scope)
 5. Sensitivity
-6. Clutter elimination (I believe only ppi scope; please research)
-7. There is some sort of control having to do with the mangatron
+6. Sensitivity time control STC / sea clutter
+7. There is some sort of control having to do with the magnetron
    but I don't know what its called and what it does.
 8. Bearing (only for a scope) which in the old days uses a servo motor to
    rotate the antenna. I don't know what form of feedback (text on the
    screen or mechanical numbers on a dial)
 9. Magnetron tune
-10. Anti clutter rain (ftc)
+10. FTC / Rain Clutter
 11. Will not need heading (this will be a fixed radar location for
     the harbor master or lifeguard
 12. Off-centering
@@ -189,6 +201,7 @@ Here are the controls that I am proposing
 14. Reset (in case kids really mess things up)
 15. Pulse length selection (short pulse for better range resolution,
     long pulse for better sensitivity at distance; operator selectable)
+16. Pulse repition frequency
 
 
 (Please suggest other controls I may have missed.)
@@ -249,6 +262,7 @@ Those classes will use a common target data structure:
 The RPi communication thread blocks on a socket read until data arrives, then
 writes to a shared target queue protected by a mutex and signals a condition
 variable. The main application consumes from that queue.
+Prefer TCP.
 
 The Raspberry Pi code will live in a separate git repository with its own CLAUDE.md
 and its own CMakeLists.txt, since it targets a different architecture (ARM) and has
@@ -275,5 +289,5 @@ Order of testing features.
 
 ========================================================
 
-Now, just comment on this, noting any errors or anything you think is smissing.
+Now, just comment on this, noting any errors or anything you think is missing.
 DO NOT GENERATE CODE