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GPS NAVIGATION

GPS NAVIGATION. INTRODUCTION. NAVIGATION. BEARINGS ECHO SOUNDING/LEAD LINE ASTRO NAVIGATION VSA & HSA DOUBLING THE ANGLE OF THE BOW. ELECTRONIC NAV. R.A.D.A.R. RDF (ROTATIONAL ANTENNA) - INERFERENCE, PARALAX HYPERBOLIC SYSTEMS (WW2)

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GPS NAVIGATION

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  1. GPS NAVIGATION INTRODUCTION

  2. NAVIGATION • BEARINGS • ECHO SOUNDING/LEAD LINE • ASTRO NAVIGATION • VSA & HSA • DOUBLING THE ANGLE OF THE BOW

  3. ELECTRONIC NAV • R.A.D.A.R. • RDF (ROTATIONAL ANTENNA) - INERFERENCE, PARALAX • HYPERBOLIC SYSTEMS (WW2) • DECCA (MASTER, 3 SLAVES) MEASURES TIME/PHASE DIFFERENCE, ACCURATE STARTING POSN ESSENTIAL 30M • LORAN C 300M, 700NM • OMEGA/CONSUL

  4. SAT NAV SYSTEMS • TRANSIT - DOPPLER, 6 SATELLITES ON POLAR ORBITS, TIME DELAYS, INTO REDUNDANCY • NAVSTAR • HF FX - LITTLE INTERFERENCE • CONSTANLY 4 VISIBLE - 3 NEEDED FOR 2 DIMENSIONAL WORK.

  5. SA REMOVED LAST YEAR BUT COULD BE RE-INTRODUCED AT ANY TIME • HAND HELD, FIXED, ECDIS, INTERFACING - SOG, COG, XTD. • SINGLE OR MULTIPLE CHANNEL OR DIFFERENTIAL - DIAGHRAM 5 M OR TO MM ACCURACEY , TRACKING, DUB CORP, FORRESTRY, MIZEN

  6. INITIAL PROGRAMMING • ON/OFF - DATE, UTC (ATOMIC BARIUM, CEASIUM - SET YOUR WATCH BY IT), LMT (Zulu or alpha - VAL ALWAYS UTC), • POSITION OF ANTENNA, • ENTER HEIGHT OF ANTENNA • APPROX LAT LONG.

  7. MAG VAR (7* w) CDMVT (AUTO?) • 050 -7 043T • STEERING BY T OR M? • IGNORE DEVIATION • SET SI’S TO NM & KNOTS, HEIGHT AND DEPTH TO METRES. • ALARMS - WP, XTD

  8. OUTPUTS • LAT, LONG • XTD, SOG, COG (GS) m or true, DTR • ETA, TTG, VMG, DMG, CTD, DTG, SET, DRIFT. SET DISTANCES FOR RHUMB LINE. • MOB - AUTO DDG AND CTS

  9. WAYPOINTS • WHAT IS A WAYPOINT • NUMBERING/NAMING • TAKING OFF CHARTS • LEAD IN TO HARBOUR - NOT A CHART WILL LEAD YOU AGROUND • WAYPOINT LIBRARY • GO TO FUNCTION - WP NO OR CHART

  10. DISPLAYS AVAILABLE • ROADWAY - BULLSEYE • STEERING NEEDLE • ALARMS • XTE, DTG, SOG, COG, CTS • DEFENSIVE NAVIGATION ==+++ • CROSS CHECK GPS WITH MK 1 EYEBALL

  11. ROUTEING - lay out plan, dist. brg between each WP • SEARCH BOXES • GO TO, DRAW HISTORY O N OR 1’ X 1’ X 2’ X 2’, ETC OR TIMED.

  12. LAND NAVIGATION • E.G. POSITION OF CASUALTY FOLLOWING CONTOURS AROUND LAKES, FOG, Marking evidence, altitude.

  13. ERRORS • CHART DATUMS - WGS 84, CORRECTIONS FROM OSGB, ED FOR CHART OR SELECT RIGHT DATUM • SA • CHART ERRORS • USER ERRORS • SATELLITE EXCLUSION - MSC OUT OF CONTACT WITH SATS FOR 6 HRS.

  14. GDOP - GEOMETRY OF SATELLITES, CUTS, 100M 95% ACCURACY • IONOSPHERIC AND ATMOSPHERIC DELAYS • CLOCK ERRORS • MULTIPATH ERRORS - GHOSTING ON TV • EPHEMERIS ERROR • TOTAL ERRORS X PDOP (4-6) = HDOP = 120M WORST CASE

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