| Bar Buoy Positions |
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| The Caernarfon Bar Buoys are on station in the following positions (12/06/2009): |
| C1 53° 07.50' N 004° 24.76' W |
| C2 53° 07.60' N 004° 24.85' W |
| C3 53° 07.63' N 004° 23.80' W |
| C4 53° 07.59' N 004° 22.81' W |
| C5 53° 07.51' N 004° 22.84' W |
| C6 53° 07.17' N 004° 21.73' W |
| The datum used for these positions is WGS 84. |
| The bar channel should not be used at any time other than 3 hours either
side of High Water (Depending on sea state). |
| The wreck of Grampian Castle lies in position 053° 07.30'N 004° 22.97'W.
Mariners are advised to exercise caution in this area. |
| These positions should be moved 0.01 minutes Southward and 0.08 minutes Eastward
for plotting on the older version of Admiralty Chart 1464 (OSGB 36). |
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| IMPORTANT INFORMATION FOR MARINERS - DEPTHS IN THE CHANNEL |
| It should be noted that the depths available in the channel have shallowed somewhat during the last 12 months and in
places the depth has reduced to about 0.3 metres at LAT. The following are the approximate minimum depths in the
channel at various tidal levels (in the absence of swell conditions and/or weather conditions): |
| Depth at MHWS = 5.1m; Depth at MHWN = 4.1m; Half-tide = 3.1m; Depth at MLWN = 2.1m; Depth at MLWS = 0.9m |
| When estimating the available depth due consideration should be given to the effect of any swell conditions existing at the
time. As any swell approaches the shoaling depths on the Bar the wavelength will shorten and the wave height will
increase. As a result the depth available can be reduced significantly in wave troughs. Due consideration should also be
given to the effects of weather. Winds between North and East will decrease the available depths, as will high
atmospheric pressure (an increase of 34 millibars over the standard pressure of 1013mb can reduce the depth by 0.3m).
For certain vessel types consideration should also be given to squat effect (this will have a more pronounced effect for
vessels with a relatively flat bottom, such as motor cruisers, and vessels operating at or near hull speed). As always it is
best to allow a safe margin for error when estimating the available depth. |
| Mariners are advised that channel buoys C4 and C5 are now positioned to the North of the wreck of the Grampian Castle. |
| Due to this a light has been fitted to channel buoy C5, with the following characteristic:- Fl(2)G.5s |
