How do I read depth soundings/contours?

Numbers are depth at LAT; contours connect points of equal depth.

Meaning of symbols for reefs, rocks, wrecks?

Crosses/dotted circles denote hazards; "VK" means wreck; "R" means reef.

How to interpret leads, transits, and sector lights?

Follow the line of the "Leading Lights"; stay within the white light sector.

What is chart datum?

The vertical reference (usually LAT) for all charted depths.

How to convert true to magnetic bearings?

Add/subtract the "Variation" found in the chart's compass rose.

What does LAT mean?

Lowest Astronomical Tide; the lowest level the tide can be expected to fall.

How do I use tidal stream arrows?

Arrows show direction; the numbers (e.g., 2,4kn) show spring/neap rates.

How to plan under-keel clearance?

(Charted Depth + Tide) - Vessel Draft = Clearance.