Session 8

GPS

Orientation II

RayNav 300

Vertical DatumVertical Datum

Select a unit of measure for water depth:

–Feet,

–Fathoms, or

–Meters.

Depth MeasurementDepth Measurement

Refer to the General Information Block on your

Nautical Chart for the correct depth (vertical)

datum.

Set your depthsounder to correspond to the vertical datum referenced on the nautical chart

that you are using.

Soundings in Fathoms

Horizontal DatumHorizontal Datum

Refer to the General Information Block on

your Nautical Chart for the horizontal datum.

Update your GPS with the HORIZONTAL DATUM

referenced on the nautical chart that you are using.

WGS84

Horizontal Datum

Distance

Select a unit of measure for DISTANCE:

–Nautical Miles–Statute Miles

When you are using your GPS on a boat, set the

Distance Unit of Measure to Nautical Miles.

SpeedSpeed

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.

Course and BearingsCourse and Bearings

Select a heading format:

–TRUE

–MAGNETIC

Update your GPS set

Time FormatTime Format

Select a time format:

–24 hour clock format

–12 hour clock format

Update your GPS set

GPS Time SetupGPS Time Setup

Select a Time Setup.

–UTC

–Local time

Update your GPS Set

Altitude ModeAltitude Mode

Set your GPS for the height of your GPS

antenna at sea level.

Update your GPS Set

Set the GPS Alarms!Set the GPS Alarms!

*XTE Alarm.

*Anchor Alarm.

*Waypoint Arrival Alarm

Alarm IllustratedAlarm Illustrated An arrival

alarm sounds whenever the boat crosses an adjustable ring around the destination waypoint

Navigation setup:

Datum 000: Datum Name: WGS84 Delta position: 0 00.000N 0 00.000W Course & bearing as: Magnetic Navigation mode: Rhumbline Auto waypoint shift: WP-line WP circle alarm ON 0.10 nm XTE alarm distance ON 0.50 nm Anchor alarm OFF 0.10 nm

Datum – from nautical chart of the area.

Delta position – offset or delta position to WGS84 from nautical chart.

Course and bearing – select magnetic or true.

Navigation mode – rhumbline navigation for shorter trips, great circle for long trips especially in the high latitudes.

Auto waypoint shift – automatic shift to next waypoint.

WP circle alarm – Alarm sounds when you enter the circle. WTE distance alarm – Sounds when you exceed on of the cross track boundaries.

Anchor alarm – Set when you anchor. Sounds when your drift beyond the parameter from the anchored position.

Horizontal Datum

Course and Bearings

Navigation Mode

Alarms:

WPT

XTE

Anchor

Unit of Measure ScreenUnit 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)

RayChart 420

Your position is here

Unit of Measure ScreenUnit of Measure ScreenNavigation 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

Unit of Measure ScreenUnit of Measure ScreenPosition 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 ________

ANY QUESTIONS?ANY QUESTIONS?

What type of speed is developed by a GPS set as you move your boat over a course line?

SOGSOGSSpeed peed OOver the ver the GGroundround

Any questions about?Any questions about?

AV Task 6-2 Critical units of measure for a GPS – page 140.

AV Task 6-3 Interpret the quality readings on a GPS set – page 141.