# Presentation: 142984

## Basic Oceanography and Acoustic Training

## Basic Oceanography and Acoustic Training

**Concepts:**

**Module 1:**
**Temperature, Salinity, and Pressure**
**T, S, and P Effects on Sound Speed**
**Module 2:**
**Bathythermograph Introduction**
**JJXX Encoding/Decoding**
**SVPD Decoding**

## Bathythermograph

**Systems**

- Basic Oceanography and Acoustic Training

## To measure and record subsurface water temperature at various depths.  Then use the temperature profile to determine a sound speed profile.

- Function

## XBT COMPONENTS

**XBT COMPONENTS**

**LAUNCHER**

**CANISTER WIRE SPOOL**

**CANISTER LOADING BREECH**

**DEPTH/TEMP CHART**

**WIRE SPOOL**

**THERMISTOR**

**PROBE (XBT)**

**STANCHION**

**ALTERNATING CURRENT POWER CABLE (3-WIRE)**

**LAUNCHER RECORDER CABLE (4-WIRE) SHIELDED**

**RECORDER**

**Notes:**
Picture of the BT set up.

## Slide 6

## Through Hull - AN/SSQ-61

**Deck Mounted - AN/SSQ-56A**

- BT Launcher Types

## Slide 8

## Slide 9

## XBT PACKAGE

**XBT PACKAGE**

**Notes:**
Let’s talk about BTs.  Is it hard or easy to get BTs in Navy supply system.  $65 for case of 12?  Two copper coils.  Uncoil from both ends.  Conducts signal.  Strong, yet flexible.  Will break.  Measures temp & connects to ship.  Yankee smarts.

## T4 - 1500FT (460M)

**T7 - 2500FT (760M)**
**AN/SQQ-36 - 1000FT **
**SSXBT - 2500FT (760M)**

**Probe Types and Max Depths**

## BT Launch Operation

**“****X” Turn on power at recorder**
**“****Y” Opens ball valve**
**“****Y” Loads BT and locks breech**
**“****X” Verifies automatic start sequence of recorder**
**“****Y” Pulls pin and releases BT**
**“****X” Verifies proper recording**
**“****Y” Removes canister, closes ball valve and breech**
**“****X” Evaluates trace**

## Bathythermograph

**Encoding/Decoding**

- Basic Oceanography and Acoustic Training

## ENCODED BT 

- PRIORITY
- P 020200Z JAN 96 PSN 352468S28
- FM USS UNDERWAY
- TO FLENUMMETOCCEN DATA MONTEREY CA
- OCEANO WEST
- C   O  N  F  I  D  E  N  T  I  A  L  //N03140//
- JJXX
- . . .

**ENCODED BT **
**MESSAGE**

**Notes:**
Address BTs to OCEANO East in Atlantic and OCEANO West in Pacific.  Oceano is now METOC.

## RADIO MESSAGE INFORMATION “JJXX”

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**MESSAGE PREFIX**

- 1

**M**1

**M1**

**M1**

**M**1

**J**

**J**

**X**

**X**

**M**

**DAY**

**MONTH**

**YR**

- DEG

**La**

**La**

**La**

**La**

**La**

**La**

**La**

**      ****INDICATOR GROUP**

- 6

- 8

- 8

- 8

- 8

- 8

**BATHYTHERMOGRAPHIC TRACE READINGS**

- DEPTH

- TEMP

- Z

- Z

- Tz

- Tz

- Tz

- Z

- Z

- Tz

- Tz

- Tz

- Tz

- Tz

- Tz

- Z

- Z

- DEPTH

- TEMP

- Z

- Z

- Tz

- Tz

- Tz

- Z

- Z

- Tz

- Tz

- Tz

- Tz

- Tz

- Tz

- Z

- Z

- DEPTH

- TEMP

- Z

- Z

- Tz

- Tz

- Tz

- Z

- Z

- Tz

- Tz

- Tz

- Tz

- Tz

- Tz

- Z

- Z

- DEPTH

- TEMP

- Z

- Z

- Tz

- Tz

- Tz

- Z

- Z

- Tz

- Tz

- Tz

- Tz

- Tz

- Tz

- Z

- Z

- DEPTH

- TEMP

- Z

- Z

- Tz

- Tz

- Tz

- Z

- Z

- Tz

- Tz

- Tz

- Tz

- Tz

- Tz

- Z

- Z

- T

- Z

- A

- B

- SQDN
- TYPE

- SQDN
- NMBR

- SORTIE NUMBER

- YR

- MON

**FOR NAVY AIRCRAFT USE**

- III.   RADIO MESSAGE INFORMATION

**Notes:**
Scan in the new JJYY.   Goes into effect 1 Sep 97.
After the 88888 group, you start your depth temp pairs.  In JJYY, there is one more field that goes after the 88888 group.  1st 3 numbers are the BT type.  For navy, 001.  For a T4 probe (standard navy BT, 1500 ft).  The last two numbers are for recorder type.  For navy, 01 for strip chart.  List of numbers is in the programmed instruction (one of the handouts).  Share it international agreement.

## RADIO MESSAGE INFORMATION “JJYY”

## Sample BT Messages

- JJYY 26028 0000/ 73246 11834 88888 42102 00167 52167 75165 90150 99901 20140 50125 99902 00115 50105 99903 10095 99904 00091 30090 57085

## Mandatory Reporting Points

** ****Mixed Layer Depth**
** ****Depth of termination for the observation**

## Sample BT Message

**JJYY**

**17028**

**DDMMY**

**00009**

**HHMMZ E/M**

**72910**

**13621**

**88888**

**42102**

**Quadrant Latitude**

**Longitude**

**Indicator Group**

**BT Type Recorder**

## Slide 20

## Sample BT Message

**JJYY**

**17028**

**DDMMY**

**00009**

**HHMMZ E/M**

**72910**

**13621**

**88888**

**42102**

**Quadrant Latitude**

**Longitude**

**Indicator Group**

**BT Type Recorder**

## BT Types

- 002	Sippican T-4		6.691	-2.25	  1500FT
- 041	Sippican T-7		6.472	-2.16	  2500FT
- 061	Sippican T-10		6.031	-2.16	   660FT
- 421	Spartan XBT-4	6.472	-2.16
- 431	Spartan XBT-5	6.828	-1.82
- 999	Unknown

**Code****	**** Instrument****	****	****    A****	****    B****	****  Max Depth**

- Equation:  z = At + 10-3 Bt2

## Recorder Types

- 04	Sippican An/BQH-7/MK8
- 05	Sippican MK-12
- 99	Unknown

**Code****	**** Recorder**

## Sample BT Message

**00646**

**09645**

**90FT**
**64.5F**

**15639**

**150FT**
**63.9F**

**36636**

**45620**

**49600**

**52570**

**360FT**
**63.6F**

**450FT**
**62.0F**

**490FT**
**60.0F**

**520FT**
**57.0F**

**0FT**
**64.6F**

## 999NN Group

**Depth (meters)****	****            999NN group encoded**
-    00-99			None
-   100-199			99901
-   200-299			99902
-   300-399			99903
-     etc.

**Depth (feet)****	****	****999NN group encoded**
-    00-999			None
-  1000-1999			99901
-  2000-2999			99902
-  3000-3999			99903
-    etc.

## Sample BT Message

**55566**

**59549**

**590FT**
**54.9**

**68534**

**680FT**
**53.4F**

**76518**

**90503**

**99901**

**03469**

**760FT**
**51.8F**

**900FT**
**50.3F**

**1000FT**
**Indicator**

**1030FT**
**46.9F**

**550FT**
**56.6F**

## Slide 27

## Sample BT Message

- JJYY 26028 0000/ 73246 11834 88888 42102 00167 52167 75165 90150 99901 20140 50125 99902 00115 50105 99903 10095 99904 00091 30090 57085

## Sample BT Message

-    M   oC
-    0	16.7
-   52	16.7
-   75	16.5
-   90	15.0

-   M	 oC
-  310	9.5
-  400	9.1
-  430	9.0
-  457	8.5

- JJYY 26028 0000/ 73246 11834 88888 42102 00167 52167 75165 90150 99901 20140 50125 99902 00115 50105 99903 10095 99904 00091 30090 57085

-   M    oC
-  120	14.0
-  150	12.5
-  200	11.5
-  250	10.5

## Miscellaneous BT Codes

## Miscellaneous BT Codes

** ****5T****z****T****z**** - 5 takes the place of the minus sign**

## Miscellaneous BT Codes

** ****5T****z****T****z**** - 5 takes the place of the minus sign**
** ****BT Hit the Bottom?**

## Miscellaneous BT Codes

** ****5T****z****T****z**** - 5 takes the place of the minus sign**
** ****00000 Code group - Reported after the last depth/temperature group if last Z/T group is the ocean bottom reading.**

## SVPD Message Format

** ****Same general format as JJXX**
** ****If English, add 4000 or 5000 to sound speed value**
** ****If Metric, add 1000 to sound speed value**

## Sample SVPG Message

## Sample SVPD Message

**SVPD**

**06028**

**DDMMY**

**00009**

**HHMMZ E/M**

**73200**

**12100**

**88888**

**009522**

**Quadrant Latitude**

**Longitude**

**Indicator Group**

**Depth/**
**Sound Speed**

## Sample SVPD Message

**029526**

**049529**

**40FT**
**4952.9FT/SEC**

**069533**

**60FT**
**4953.3FT/SEC**

**089544**

**119548**

**139539**

**169507**

**80FT**
**4954.4FT/SEC**

**110FT**
**4954.8FT/SEC**

**130FT**
**4953.9FT/SEC**

**160FT**
**4950.7FT/SEC**

**20FT**
**4952.6FT/SEC**

## Sample SVPG Message

-  FT	FT/SEC
-   0	4952.2
-  10	4952.4
-  20	4952.6
-  40	4952.9
-  60	4953.3
-  80	4954.4
- 110	4954.8
- 130	4953.9
- 160	4950.7
- 210	4943.4
- 250	4938.0

-  FT	FT/SEC
-  330	4922.2
-  410	4902.0
-  490	4896.3
-  660	4886.5
-  980	4875.2
- 1310	4868.2
- 1640	4865.3
- 1970	4863.3
- 2300	4862.3
- 2620	4862.3
- 2950	4863.3

-   FT	FT/SEC
-  3280	4864.7
-  3610	4866.5
-  3940	4868.6
-  4270	4871.0
-  4590	4873.6
-  4920	4876.5
-  5740	4884.5
-  6560	4894.3
-  8200	4917.8
-  9840	4944.2
- 11720	4922.4

**SLD**

**DSCA**