OBS Navigation & Route Planning 3

Question 1

What does a flashing yellow light on a buoy typically indicate?

Accepted Answer

A danger or hazard area requiring caution

Answer

Flashing yellow lights mark caution areas, such as traffic separation zones or areas requiring special attention.

Question 2

A nautical chart shows a depth of 15 feet at Mean Lower Low Water (MLLW). What does this mean for your planning?

Accepted Answer

The depth will never be less than 15 feet

Answer

MLLW is the charted datum (reference level), so actual depths are at or above the charted figure under normal conditions.

Question 3

When using a paper chart, what tool is used to measure distances?

Accepted Answer

Dividers or a compass

Answer

Dividers are used to measure distances on a chart by comparing the spread against the latitude scale on the chart's border.

Question 4

What is a 'range' in coastal navigation?

Accepted Answer

Two objects aligned to indicate a safe navigational track

Answer

A range consists of two fixed markers that, when aligned, guide a vessel safely along a specific track or into a channel.

Question 5

What is 'dead reckoning' navigation?

Accepted Answer

Estimating current position using last known position, speed, heading, and time

Answer

Dead reckoning calculates an estimated present position from a known past position, accounting for speed, direction, and elapsed time.

(OBS) Online Boating Safety Certification Practice Test