Estimated position with tidal stream, diamond N

Exercise book 4.6 · on paper you need RYA chart 3, the tidal almanac, the deviation card

On Saturday 12 October at 1355 SPDST you are at 45°47.41'N 005°42.53'W with the log at 11.4; at 1425 SPDST the log reads 17.9. You steer 300° by compass in a westerly force 2, leeway nil. Variation 6°W. Use tidal diamond N. Find a) the EP at 1425; b) the course and speed over the ground (COG and SOG).

Starting position: 45°47.41'N 005°42.53'W
Log: 11.4 at 1355, 17.9 at 1425 SPDST
Compass course: 300°C
Variation: 6°W
Victoria 12 Oct (UT): HW 1425 5.0 m; LW 0811 1.6 m, 2043 1.6 m
Diamond N, HW−2: 129° 4.5 kn springs / 2.3 kn neaps

Solution worked out by us from the course material: to be checked by the instructor.