Navigation

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• Navigation
• Systems
• GPS
• Set Ups

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Vertical Datum

• Select a unit of measure for water depth
• Feet,
• Fathoms, or
• Meters.

3
Depth Reference

• Refer to the General Information Block on your
  NOAA Chart for the correct depth (vertical) datum.

4
Soundings in Fathoms at MLLW-Mean Lower Low Water.

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Horizontal Datum
Update your GPS with the HORIZONTAL DATUM referenced on the nautical chart that you are using. WGS84

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Horizontal Datum

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Distance
When you are using your GPS on a boat, always set the Distance Unit of Measure to Nautical Miles.

• Select a unit of measure for DISTANCE
• Nautical Miles
• Statute Miles

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Speed

• Select a unit of measure for SPEED
• Nautical miles per hour - KNOTS.
• Statute miles per hour - MPH

When you are using GPS on a boat, set the speed unit of measure to KNOTS Nautical Miles Per Hour. (May be automatic)
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Course and Bearings

• Select a heading format
• TRUE
• MAGNETIC

Update your GPS set
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Time Format

• Select a time format
• 24 hour clock format
• 12 hour clock format

Update your GPS set
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GPS Time Setup

• Select a Time Setup.
• UTC
• Local time

Update your GPS Set
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Altitude Mode

• Set your GPS for the height of your GPS antenna
  at sea level.

Update your GPS Set
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RayNav 300
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GPS 76-Handheld
ANTENNA
IN (ZOOM) OUT
CURSOR
NAV
PAGE
POWER (LIGHT)
MENU
QUIT
ENTER
SCREEN
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Set the GPS Alarms!

• XTE Alarm.
• Anchor Alarm.
• Waypoint Arrival Alarm

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Waypoint Arrival Alarm Illustrated

• An arrival alarm sounds whenever the boat
  crosses an adjustable ring around the destination
  waypoint.

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Horizontal Datum Course and Bearings Navigation Mode Alarms WPT XTE Anchor

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Unit of Measure Screen

• Set up for Units
• Depth/Altitude in FEET
• Distance in NAUTICAL MILES
• Speed in KNOTS
• Temperature in FAHRENHEIT
• WIN change interval 05 sec MANUAL
• Display text in ENGLISH (US)

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Your position is here
RayChart 420
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Unit of Measure Screen

• Navigation Set up
• Datum Name World Geodetic System 1984
• Delta position 0-00.000N 0-00.000W
• Course and bearings
  TRUE
• Navigation Mode RHUMBLINE
• WP circle alarm ON
  0.10nm
• XTE alarm distance ON
  0.10nm
• Anchor alarm OFF
  0.00nm

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Unit of Measure Screen

• Position Setup
• Manual antenna altitude 2m
• Altitude mode
  MANUAL
• Display depth in POS display YES
  
• DGPS input format RTCM
  1.04
• DGPS data 0, max 2, test
  1860
• Speed and course filter level
  3
• Start Position LAT_______ LON ________

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ANY QUESTIONS?

• What type of speed is developed by a GPS set as
  you move your boat over a course line?
• Speed Thru the Water
• Speed Over the Ground
• Ded Reconing Line
• Speed Made Good