Course to steer with two tidal diamonds

Exercise book 3.4 · on paper you need RYA chart 3, the tidal almanac, the deviation card

On 18 September at 0544 SPDST you leave 45°50.56'N 005°48.87'W for 45°46.93'N 005°57.24'W. The boat makes 7.5 knots, the wind is northerly with 5° of leeway and variation is 6°W. For the first 30 minutes the stream is that of diamond N, then that of diamond P. What compass course should you steer, and how long will it take?

Starting position: 45°50.56'N 005°48.87'W
Destination: 45°46.93'N 005°57.24'W
Boat speed: 7.5 kn
Leeway: 5°, wind N
Variation: 6°W
Victoria 18 Sep (UT): HW 0844 4.9 m; LW 0219 1.5 m, 1436 1.7 m
Diamond N, HW−5: 312° 3.1 kn springs / 1.6 kn neaps
Diamond P, HW−4: 096° 1.4 kn springs / 0.7 kn neaps

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