diff --git a/Cargo.toml b/Cargo.toml
index e8da63d..dcf1744 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,6 +6,8 @@ edition = "2021"
 description = "Converts SBF to RINEX"
 
 [dependencies]
+binread = "2.2.0"
+bstr = "1.9"
+clap = { version = "4.4", features = [] }
 rinex = "0.15"
-thiserror = "1.0"
-clap = { version = "4.4.12", features = [] }
\ No newline at end of file
+thiserror = "1.0"
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index e4a2b75..e8073a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -23,7 +23,7 @@ pub fn main() -> Result<(), Error> {
         .get_matches();
     let filepath: String = matches.get_one::<String>("i").unwrap().to_string();
     let rinexrec = sbf2rnxrec(filepath);
-    // write_rnx_file(rinexrec);
+    //write_rnx_file(rinexrec);
     Ok(())
 }
 
@@ -31,9 +31,8 @@ fn sbf2rnxrec(filepath: String) -> Rinex {
     //! Build RINEX records and output them as files
     // For now we read the entire file as bytes before conversion - this uses more memory!
 
-    let rrecord: Rinex = Rinex::default();
     match std::fs::read(Path::new(&filepath).as_os_str()) {
-        Ok(bytes) => { process_sbfdata(bytes) }
+        Ok(bytes) => { sbf::process_sbfdata(bytes) }
         Err(e) => {
             if e.kind() == std::io::ErrorKind::NotFound {
                 eprintln!("Please check path {}", &filepath);
@@ -46,18 +45,8 @@ fn sbf2rnxrec(filepath: String) -> Rinex {
             panic!("{}", e);
         }
     }
-
-    rrecord
 }
 
-fn process_sbfdata(bytes: Vec<u8>) {
-    const SBF_SYNC1: u8 = 0x24;        /* SBF message header sync field 1 (correspond to $) */
-    const SBF_SYNC2: u8 = 0x40;        /* SBF message header sync field 2 (correspond to @)*/
-    // let's find SBF blocks by their sync bytes
-    for byte in bytes {
-        eprintln!("Read byte {}", byte);
-    }
-}
 
 fn write_rnx_file(rinexrec: Rinex) {
     rinexrec.to_file("test.rnx").expect("Error: RINEX writeout failed.");
diff --git a/src/sbf.rs b/src/sbf.rs
index c1cb0ed..2f1d44e 100644
--- a/src/sbf.rs
+++ b/src/sbf.rs
@@ -1,4 +1,6 @@
 //! Record holding the extracted information from an SBF file, arranged
+use bstr::ByteSlice;
+use rinex::Rinex;
 
 #[derive(Clone, Debug)]
 pub struct SbfBlockHeader {
@@ -21,6 +23,9 @@ pub struct SbfBlock {
     timestamp: SbfBlockTimestamp,
 }
 
+pub(crate) const SBF_SYNC1: u8 = 0x24;        /* SBF message header sync field 1 (correspond to $) */
+pub(crate) const SBF_SYNC2: u8 = 0x40;        /* SBF message header sync field 2 (correspond to @)*/
+
 // ====== SBF BLOCK DATA ======
 
 // --- Measurement Blocks ---
@@ -336,6 +341,17 @@ fn decode_galalm(galalmdata: u8) -> u8 {
     galalmdata // Placeholder
 }
 
-fn decode_sbf(sbfdata: u8) -> u8 {
-    sbfdata // Placeholder
+pub(crate) fn process_sbfdata(bytes: Vec<u8>) -> Rinex {
+    // let's find SBF blocks by using their sync bytes
+
+    let pattern: [u8; 2] = [SBF_SYNC1, SBF_SYNC2];
+    let result: Vec<Vec<u8>> = bytes.split_str(&pattern).map(|x| x.to_vec()).collect();
+    // now we have a collection of SBF blocks
+    for block in result {
+        eprintln!("Read block {:?}", block);
+        // let crc = ((block[1] as u16) << 8) | block[2] as u16;
+        // eprintln!("CRC: {}", crc);
+    }
+
+    Rinex::default() // Placeholder to output right type for now
 }