GENERAL INFORMATION FOR TRANSITTING MARION NARROWS AND DENISON CANAL – 17 December 2013
CHARTLET OF MARION NARROWS
The attached chartlet of Marion Narrows provides depth information laid over Chart AUS169.
The chartlet is NOT FOR NAVIGATION PURPOSES and has been provided for guidance purposes only. Mariners are strongly recommended to use AUS169 when navigating this area. The depths on the chartlet are those measured on the date shown on the chartlet. Depths are in metres, referenced to Chart Datum using the Hobart Tide Tables. Conditions continually change at the Narrows and depths experienced may differ from the chartlet.
Mariners are advised not to attempt to enter Blackman Bay through the Narrows in heavy north-easterly conditions. Only vessels with a shallow draft who have sought local knowledge should transit the Narrows. Navigate only at high tide and in daylight hours.
The main stream of the flood tide runs into Blackman Bay - ie, in a north-easterly direction at the Denison Canal and a south-westerly direction at the Marion Bay Narrows. The reverse applies for an ebb tide.
Tide times can be calculated with reference to tide tables with the following adjustments:
Flood Stream commences 2 hours 27 minutes after low water at Hobart
Ebb Stream commences 2 hours 16 minutes after high water at Hobart
Remember to adjust for daylight saving time.
Mariners should remember that tide conditions may differ depending on factors such as barometric pressure, prevailing winds etc.
DENISON CANAL TRANSIT
The Denison Canal can be transited between the hours of 8.00am and 5.00pm and it is recommended that contact is made with the Canal Superintendent one day prior to canal transit. The Superintendent can be contacted on:
Telephone: (03) 6253 5113
VHF Ch16 Call Sign "Denison Canal"
27MHz Radio: 27.880Mhz
RADIO LISTENING WATCH
Tas Maritime Radio maintains a listening watch in Southern Tasmania including Marion Narrows/Denison Canal from 0730 - 1930 daily on VHF Ch16 and HF 4125, 6215 and 8291 kHz. Weather sked times are 0745, 1345 and 1903. Weather is pre-announced on VHF Ch 16, 2182 kHz, 4125kHz, 6215kHz and is provided on VHF Ch 67, 68 and 2524kHz, 4146kHz and 6227kHz.
Note that Tas Maritime Radio does not provide Marion Narrows and Denison Canal transit advice.
DENISON CANAL APPROACH CHANNELS.
The minimum depth at the Dunalley Bay (western) approach channel to the canal was 1.3 metres measured relative to chart datum on 17 December 2013. This depth was measured adjacent to the second starboard lateral mark, approaching from Dunalley Bay.
The minimum depth at the Blackman Bay (eastern) approach channel to the canal was 1.6 metres relative to chart datum on 17 December 2013. These measurements are based on Hobart tide tables and appropriate time adjustments.
Notwithstanding any of the information displayed herein, which has been supplied in good faith, Marine and Safety Tasmania cannot be held responsible for errors or omissions this document may have inadvertently portrayed. Mariners should also check for Notices to Mariners.