Using a chart ´spiders web´ to quickly plot your position and bearing underway.

A spiders web is simply a pre-drawn array of bearing lines drawn on a paper chart from a common point, augmented by useful distance rings centred around the same point (Figure 1).

Using a chart spiders web to quickly plot your position and bearing underway

Figure 2 shows my well-worn chart for the approach to my home port of Christchurch Harbour. All I do is set the Christchurch Harbour entrance buoy as a waypoint on my Chart Plotter, and read off the bearing and distance to run from the electronics as I approach home, and then plot the position on my paper chart.

Using a chart spiders web to quickly plot your position and bearing underway

Many small vessels coming home from the west take the inner channel over Christchurch Ledge. There is a series of rocks just off the shore on the eastern side of Hengistbury Head, however, that has sheared off many a propeller leg. So you can see I have cross-hatched in the danger area on the chart to remind me not to add my props to the tally.

Season 2023/24

Season 2023/24
Call Will for all boat training requirements on
01202 836721

Bespoke Tuition to suit your requirements, can also include crew training on your boat.
Call Will to discuss on
01202 836721

Saltwater RYA Powerboat training centre is perfectly situated to offer on-the-water powerboat training on river, harbour and inshore waters

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Saltwater Experience
Bailey Bridge Marina,
10 Bailey Drive,
Dorset BH23 2BN

Tel: 01202 836721

Principal: Will Eveleigh
Chief Instructor: Lloyd James