HOW DID SAILORS

NAVIGATEBEFORE GPS

?

?Trouble Plotting Your Location

?Trouble Plotting Your Location

Throw Over Bow

Time for 30 seconds

Record speedin knots

Count Numberof knots

Plotting Your Speed

Throw Over Bow

Time for 30 seconds

Record speedin knots

Count Numberof knots

Plotting Your Speed

Set to 0 Dagrees

Setting Up Sextant Shades On!

Set to 0 Dagrees

Setting Up Sextant Shades On!

Squeeze clamp to release index bar

Use the micrometerto adjust the position of the sun.So that it sits perfectly on the horizon.

Finding Latitude

Line the sunup with the horizon

Squeeze clamp to release index bar

Use the micrometerto adjust the position of the sun.So that it sits perfectly on the horizon.

Finding Latitude

Line the sunup with the horizon

Look at the seconds first, then minutes, make a record of it.This is your first steps to finding your Longitude!

Establishing Reading

QUICKLY! -

Look at the seconds first, then minutes, make a record of it.This is your first steps to finding your Longitude!

Establishing Reading

QUICKLY! -

If the chronometer says 2pm, when it is noon local time, you know you are 2 hours behind,

therefore, your position lies on the on the corresponding meridian.To find out your exact position the seconds and minutes hands are used.

Finding Longitude

Local Time

(GMT)

- 1hr- 2hrs- 3hrs- 4hrs

If the chronometer says 2pm, when it is noon local time, you know you are 2 hours behind,

therefore, your position lies on the on the corresponding meridian.To find out your exact position the seconds and minutes hands are used.

Finding Longitude

Local Time

(GMT)

- 1hr- 2hrs- 3hrs- 4hrs

Latit

ude

Longitude

Use the cordinates you have calculated in the previous stepsto plot your exact location.Plotting Longitude

& Lattitude

Latit

ude

Longitude

Use the cordinates you have calculated in the previous stepsto plot your exact location.Plotting Longitude

& Lattitude

Produced By

Nathan Drury &

Natalie Faunch