A nautical chart is not wall decoration. It is your main working tool before any trip. Read it properly and you know where the deep water runs, where the shallows and reefs sit, and where the harbour entrance actually is. Here is the practical way to work through one.
A road map gives you streets and buildings. A nautical chart gives you water depth, seabed type, buoys, breakwaters and safety detail. The numbers on it are not distances, they are depths. That is exactly why a normal phone map app is the wrong tool once you leave the marina.
Each printed number shows the water depth at that point. Read it as a whole figure: 3.5 means three and a half metres, 12 means twelve metres. Always confirm the unit printed on the chart, metres or fathoms, because confusing the two changes everything. Check the chart date too, since sandbars move and surveys age.
Colours are a fast visual warning, not decoration:
Lines that snake across the chart like hillside contours join points of equal depth. When they crowd close together, the seabed drops away quickly. That tight spacing is a stronger warning than any single number, so scan the shape of the lines, not just the figures.
Buoys are drawn with standard symbols: shape, colour and number tell you the job each one does. Learn the marks for channel entrances, safe water, isolated dangers and cardinal marks. In this region, red buoys mark the edge of a channel and are left to starboard on entry, green to port, under the IALA system in use across the Gulf.
The latitude and longitude grid lets you plot positions in degrees, minutes and seconds. Always record your waypoints before departure and write them on paper as a backup. The scale tells you the ratio of the drawing: on a 1:50,000 chart, one centimetre on paper equals half a kilometre on the water.
Chart margins carry tide data, current arrows and notes on local hazards. That is where you learn which channels tighten at low water. B7R covers the navigation side with marine navigation tools and tide times for Shuwaikh and Shuaiba ports, so your plotting and your timing sit in one place before you cast off.
Draw your route in pencil, mark the waypoints, and highlight the danger zones along the way. After the trip, compare the line you drew with the one you actually sailed. Ten minutes of that after each outing turns chart reading from homework into instinct. Keep your plotted waypoints in B7R and they are waiting for you next time, on the same screen as your tide plan.
Download the B7R app free on Google Play: B7R on Google Play