What is the route?
Image: Visit Isles of Scilly
The route requires a rise of the tide to pass over Crow Bar, a shallow bank that separates Crow Sound from St. Mary’s Road, that has the least depth of 0.4 metres LAT through its channels along this passage. The use of this entrance route must, therefore, be timed for a sufficient rise of tide to clear the bar. Crow Sound is not recommended after dark because it has no lit markers and it requires eyeball navigation to identify any potentially shifting sands.
Why sail this route?The primary advantage of Crow Sound is it provides an approach that is sheltered from the prevailing west and southwest winds. Given suitable weather and state of the tide, in an excellent alternate approach to St Mary's Road and when it is available the island a passenger ship, RMV Scillonian III, takes this route.
Tidal overviewToday's summary tidal overview for this route as of Sunday, April 11th at 04:23. The principal focus of this route is to secure a sufficient rise of tide to pass through the Bar Channel with the streams being secondary. We provide tidal streams here for convenience. The northeast going stream along the southern coast of St. Mary's turns northward into Crow sound after 0145 Devonport (+ 0500 Dover). Off Watermill Cove the northwest-going stream, spring rate 0.9 knots, begins +0430 Devonport (-0110 Dover) and runs for 3 hours only. The east by southeast going stream, spring rate 0.9 knots, begins -0455 Devonport (+0150 Dover) and runs till -0100 Devonport (+0545 Dover). The stream is then slack, for a short period, after which it again runs east by southeastward, spring rate 0.7 knots, till +0430 Devonport (-0110 Dover). Between Hats and Crow Bar the stream is irregular and weak, with a rate which does not exceed 0.5 knots at springs.
Within Crow Sound the streams are much weaker, rarely exceeding 1 knot at springs, running (NW) into the Sound for 3 hours from HA HW Dover -0100, then out of the sound (ESE) for eight hours, beginning HW Dover +0200.
Southeast going stream
(HW Dover +0150 to +0545)
Starts in 09:33:53
(Sun 13:57 to 17:52)
(HW Dover -0110 to +0150)
Starts in 06:33:53
(Sun 10:57 to 13:57)
What are the navigational notes?
Hats Cardinal, 49° 56.198' N, 006° 17.136' W
Adjacent Hats south cardinal marker, VQ(6)+LF1.10s
► Next waypoint: 0.57 miles, course ⇓ 282.92°T (reciprocal ⇑ 102.92°T)
Bar Channel, 49° 56.326' N, 006° 18.003' W
In the Bar Channel 50 metres south of the Queen's Ledge rock a rock which dries to 0.2 metres and is located about 300 metres northwestward of Bar Point.
► Next waypoint: 0.16 miles, course ⇓ 264.15°T (reciprocal ⇑ 84.15°T)
NE Approaches to Crow Rock , 49° 56.310' N, 006° 18.246' W
This is on the alignment of the South Hill of Samson with the beacon on 254° T 300 metres to the northeast Crow Rock. It is positioned 100 metres north of a second unnamed rock that also dries to 0.2 metres and is an outlier of the reefs extending from Bants Carn to Bar Point. There is also the remains of a wreck close south to this position.
► Next waypoint: 0.63 miles, course ⇓ 236.29°T (reciprocal ⇑ 56.29°T)
Saint Mary's Road, 49° 55.963' N, 006° 19.054' W
The north end of Saint Mary's Road about 400 metres westward of Creeb and on the alignment of Nut Rock on a bearing of 260° T in line with the summit of the South Hill on Sampson.
► Next waypoint: 0.59 miles, course ⇓ 185.99°T (reciprocal ⇑ 5.99°T)