I was awake early after an early night to find a heavy mist, it had not been forecast and I suspected it was fairly local so decided to move off to get at least the first hour or two against a relatively slack tide. At 06:30 I could see both banks of the Loch, 5 minutes after I had got the anchor up everything had disappeared with the visibility perhaps 20 yards.
I was tempted to put the anchor back down but decided not to and gingerly went down the Loch at a walking pace, fortunately my modern doppler radar is particularly good close in with essentially no minimum range and at 100 meters (or less) will show just about everything, even reasonably sized pot markers in smooth water.
There is quite a lot of detail in the next bit as I am thinking of using it as part of a post or page on navigating in fog.
I had two independent DGPS's running and visible, one the 9" plotter with Garmin vector charts derived from the UKHO, the other a 10.5" iPad with raster charts including the very accurate Antares GPS charts of the entrance and the anchorage (the lap top with Admiralty & Antares raster charts and different vector charts was not going to be any use as it is on the chart table). I could also have had a spare iPad and / or phone running vector or raster charts but that would have been a bit over the top!
As a bonus the plotter and iPad has tracks from previous visits (optionally displayed) my track inbound was my preferred one to follow as it was clear of lobster pots the day before and I displayed just that one on the iPad, see below.
Most of Loch Aline was last surveyed by lead line for the UKHO in 1921, and a few parts of the Sound of Mull not since 1904, I have frequently seen much older and current plotters, other than seriously expensive ones for commercial use, don't tell you. Another good reason for having Admiralty raster or paper charts, or both (Imray charts don't tell you either). The Antares survey was in May 2015.Approaching the loch entrance, the red blob ahead of me is the port lateral buoy, about 150 yards away, I saw it at 50 as the fog lifted. With a good rise of tide I could be sure of not running aground if I stayed within the previous tracks some of which were at low water.
The AIS contact at the top of the radar screen "Lara of Chichester" is, as I write, one berth down from me at Tobermory. She had left her AIS on whilst parked and arrived there in the early evening.
| My inbound (right at the bottom) and outbound tracks, the channel is about 75 yards wide. |
| The ferry on her berth, about 75 yards away with the fog lifting further. |
| 14 miles in 4 hours. |






