Please select your home edition
Edition
Selden 2020 - LEADERBOARD

The biggest question when going to sea - Where am I?

by Lee Mylchreest on 23 Sep 2013
Using every mode available to establish and reconfirm your position (Credit: Hamish Hooper/CAMPER ETNZ/Volvo Ocean Race) Hamish Hooper/Camper ETNZ/Volvo Ocean Race
Before technology surfaced, early mariners, over the centuries, devised many crude solutions to determine where they were in the water. The death of a friend recently on a reef in the Tuomotos, through a small miscalculation, has had me ruminating on how seafarers stayed safe over the thousands of years they have been transiting the ocean.

The Compass:
The earliest compasses were most likely invented by the Chinese in around 1050 BCE. Intriguingly, they were created first for the purposes of spiritual life or developing a feng shui environment and then only later used for navigation.

Compasses were originally developed when lodestones, a mineral that has naturally magnetized iron ore, were suspended above a board with the ability to pivot and turn. It was discovered that the stones would always point in the same direction, and align themselves with the north/south axis of the earth.

Then crude charts were drawn. The forerunner of the modern magnetic compass consisted of a magnetized needle placed in a piece of cork, which floated in a pan of water. The marked end of the needle pointed to magnetic north. This primitive form of a compass went through many changes prior to the development of the modern day instrument.

The superiority of modern equipment - with caveats:
Today it is much easier to find out where we are on earth. As well as GPS, we now have depth recorders and other electronic devices supposedly answering the question, 'Where are we?'

However, total trust in the GPS can end in tragedy on the sea - and often has. There are a number of reasons for this:

1. The GPS position being 'wrong' when related to the (correct) chart it is shown on
2. Inaccurate reading of the GPS by the skipper
3. A lightning strike destroying all metal equipment on the boat
4. Inaccurate out-of-date charting, particularly in remote areas

Back-ups - the paper chart:
When navigating large bodies of water, there is no substitute for having a paper chart readily available. Even with advanced technology, it's an excellent idea to keep track of your boat's position on paper as a back-up to your electronic equipment's information or as a starting point for doing without it when it fails.

Dead Reckoning:
The advancement of the boat's position on the chart from the last accurate position using courses steered and speed through the water is known as dead reckoning. A dead reckoning track line is drawn on the chart from a known position to your destination. To plot the direction your boat is headed on the course line, many types of course plotters may be used to determine the direction of travel by a compass rose on the chart.

With the boat's known speed and time traveled, you can plot your position on the course line -- usually hourly.

In the final analysis, it is the intelligent use of all the systems available to the seafarer which denotes good seamanship and it likely to bring the skipper and crew home safely, rather than the sophistication of the equipment available.

Allen Dynamic 40 FooterV-DRY-XX-Yachts X4.0

Related Articles

Gran Canaria Gloria Windsurf World Cup Day 2
Philip Köster triumphs again in Pozo Izquierdo The 37th edition of the Gran Canaria Gloria Windsurf World Cup delivered a thrilling second day this Sunday, once again marked by strong winds and the talent of the world's best windsurfers.
Posted today at 8:47 pm
A perfect start to the 5th annual AEGEAN 600
Cloudless blue skies, crystal clear waters and perfect 12-15 knots of northerly wind At the very southern end of the Greek mainland at Cape Sounion in Attica, today's start to the 5th edition of the AEGEAN 600 was perfect: cloudless blue skies, crystal clear waters and perfect 12-15 knots of northerly wind.
Posted today at 8:39 pm
29er Europeans at Lake Garda day 4
One race, one storm, and one big lay day vibe With qualification wrapped and the fleet now split into six groups—Gold, Silver, Bronze, Emerald, Purple, and White—Day 4 of the 29er Europeans kicked off with early optimism and an earlier-than-usual launch in pursuit of the morning breeze.
Posted today at 7:09 pm
iQFOiL Worlds a Aarhus day 1
Full foiling conditions launch the World Championship with four high-intensity races for both fleets The iQFOiL World Championship kicked off today in Aarhus with dynamic and demanding conditions that truly tested the world's top foiling windsurfers. The wind was anything but steady, shifting in both direction and intensity throughout the day.
Posted today at 7:01 pm
Rolex TP52 Worlds in Cascais overall
American Magic Quantum Racing win Rolex TP52 Worlds after breezy week in Cascais. Doug DeVos' American Magic Quantum Racing crew were crowned 2025 Rolex TP52 World Champions today in Cascais, Portugal.
Posted today at 6:54 pm
Red Bull Sailing Academy Opens
A new hub for current and future superstars to reach the top of their sport Marina Monfalcone, North Italy, made waves yesterday, as sports superstars gathered to open the Red Bull Sailing Academy, marking the beginning of a new era in the sport.
Posted today at 12:53 pm
Gran Canaria Gloria Windsurf World Cup Day 1
Philip Köster edges out Marcilio Browne in one of the closest finals ever Philip Köster edges out Marcilio Browne in one of the closest finals ever as Pozo delivers 50 knot winds and waves.
Posted today at 11:42 am
America's Cup: French give the Brits the "Hurry-up
Frustration builds between Cup factions over lack of progress with Protocol. Last weekend's missive from the French America's Cup challenge team is further evidence over the building frustration with progress towards the 2027 America's Cup in Naples.
Posted today at 11:12 am
The oldest video footage of Moth sailing
A look back into our video archive, to when the name of this class first settled down We delve into our video archive to find the oldest possible videos that show Moth racing. Are these International Moths, British Moths... or was the name still Olive, Inverloch 11ft, National Moth or Brent One-Design?!
Posted today at 11:00 am
GKSS Match Cup & Nordea Women's Trophy overall
It is the first time the Match Cup Sweden title has been won by a Danish Skipper Denmark's Jeppe Borch/ Team Borch Match Race, and France's Pauline Courtois/ Match in Pink by Normandy crowned the new champions of Marstrand in a day of fierce weather for the final of 2025 GKSS Match Cup Sweden and Nordea Women's Trophy in Marstrand.
Posted today at 7:14 am