Compass Navigation for Kayaking and Boating: Coastal & Open Water Basics

Navigating on open water introduces a complicating factor unknown to land hikers: the ground beneath you is moving. While a land hiker walks across solid rock, a sea kayaker or boat captain moves through a fluid medium with active currents, tidal flows, and wind drift.

Navigators distinguish between two critical terms:

• Heading: The direction the bow of the boat is pointing (read directly from your compass).
• Course Over Ground (COG): The actual track the boat traces across the seabed when affected by wind and current.

If you want to paddle directly East (090°) to an island 3 miles offshore, but a strong 2-knot tidal current is flowing South (180°), pointing your boat at 090° will cause you to sweep far to the south, missing the island entirely.

To compensate, you must calculate a ferry angle: steer your boat slightly upstream (Northeast, perhaps 065°) into the current. The forward speed of your boat and the southward push of the tide will cancel each other out, driving you in a straight line over the ground toward your target.

The single most powerful visual technique for coastal boaters and sea kayakers is the transit (leading line):

1. Look toward the shore behind you or ahead of you and line up two fixed objects at different distances (e.g., a lighthouse in the foreground with a radio tower on a distant ridge behind it).
2. As you paddle, keep those two objects perfectly aligned in your line of sight.
3. If the front object shifts to the right of the rear object, you are drifting left. If it shifts left, you are drifting right. You immediately know you are being pushed by cross-currents without even looking at your chart.