EP & running fix

learnthesea.com

Work up an estimated position from your DR, the hour’s tidal stream and leeway; or fix from one object by transferring the first bearing along your track.

Date / time

Log reading

Course steered °C

Dead reckoning

From (last fix)

Time of last fix

Boat speed (kn)

Course steered °T

Distance run (M)

Leeway (°) & direction

Tidal stream this hour

Set °T

Rate (kn)

Source (diamond / atlas)

Plot — DR, tide, EP (and a transferred bearing for a running fix)

1. DR from the last fix. 2. Apply the tidal vector → EP. 3. For a running fix, transfer the first position line along the ground track and cross it with the second.

Result

EP / fix — latitude

EP / fix — longitude