diff --git a/ADS-B(S).md b/ADS-B(S).md
index 285b32d..2dae0db 100644
--- a/ADS-B(S).md
+++ b/ADS-B(S).md
@@ -3,7 +3,7 @@
 The Key Items on the App that can be selected with the cursor and changed with the encoder knob are:
 
 * **Title bar:** The usual Items may be changed and displayed.
-* **Tab pages:** The Tab pages for the settings that are can be selected are **Position, Callsign, Speed, Squark**. This data is not held in persistent memory except for the frequency.
+* **Tab pages:** The Tab pages for the settings that are can be selected are **Position, Callsign, Speed, Squawk**. This data is not held in persistent memory except for the frequency.
 
 ## Position Tab
 **ICAO24:**  This code is selected with rotary encoder to enter the 6 digit numeric  number. This is sometimes called the Mode S code and is a 24-bit unique number that is assigned to each vehicle or object that can transmit ADS-B messages. It is usually transmitted by aircraft but some airport ground vehicles and multi-lateration towers also have ICAO24 codes assigned to them.
@@ -22,9 +22,9 @@ Transmit position: this is a tick box to enable the transmission of Alt. Lat. Lo
 * **Bearing:** The value is selected and the rotary encoder is used to select the value 0-999kn. 0-359 Degrees.
 * **Vertical Rate:** The value is selected and the rotary encoder is used to select the value -4096 to +4096 ft/min in steps of 64 (following the encoding standard). It indicates the vertical rate speed of the plane (+) climbing , (-) descending. In real plane ,that Vr source information can come from GNSS or Barometric altitude equipment. In mayhem fw , we are simulating a fix source from GNSS.
 
-## Squark Tab 
-* **Transmit squark:** This is a tick box to turn on the transmission of the [Squark](https://en.wikipedia.org/wiki/List_of_transponder_codes) code. 
-* **Squark:** This can be selected with rotary encoder and has specific meanings. The code is from 0-9999.   https://en.wikipedia.org/wiki/List_of_transponder_codes
+## Squawk Tab 
+* **Transmit squawk:** This is a tick box to turn on the transmission of the [Squawk](https://en.wikipedia.org/wiki/List_of_transponder_codes) code. 
+* **Squark:** This can be selected with rotary encoder and has specific meanings. The system identifies an aircraft through a four-digit octal number. (each digit number from 0-7), which provides up to 4.096 possilbe codes.  The squawk code is from 0-7777.   https://en.wikipedia.org/wiki/List_of_transponder_codes
 
 ## Common to all Tabs 
 * **Frequency:** At the lower part of the App is the Frequency setting. This is stored in persistent memory