Search found 56 matches

by packo
Tue, 21 Sep 2021 9:53 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Packo Slack Water Tables -2021
Replies: 15
Views: 16962

Re: The Packo Slack Water Tables -2021

Hi, The October to December 2021 "packo predictions" for Port Phillip Heads are now available from the updated links at the top of the original post. Next expected 3 monthly update (Jan --> March 2022) will be around the 22nd of December 2021. Gee the Covid-19 virus is still smashing the w...
by packo
Tue, 31 Aug 2021 8:14 pm
Forum: Hanging On the Deco Line
Topic: Pt Lonsdale - Proposal to "kill off" Clarkes and Marcus Hill Beacons
Replies: 0
Views: 46

Pt Lonsdale - Proposal to "kill off" Clarkes and Marcus Hill Beacons

Hi, A recent Notice to Mariners shows there is a proposal to decommission both the Clarkes Beacon (near shore foreground object) and Marcus Hill Beacon (background object). The visual alignment of these two marks part of the Marine Park boundary on both sides of the Heads. It also gives a clearance ...
by packo
Sat, 24 Jul 2021 9:34 pm
Forum: Scuba Doctor Dive Maps
Topic: Bayonet and Gulf of Carpentaria GPS "Mystery Marks"
Replies: 0
Views: 5118

Bayonet and Gulf of Carpentaria GPS "Mystery Marks"

****** Ex HMAS Bayonent and Gulf of Carpentaria GPS "Mystery Marks". ****** 5km lock-down (again) in July! Freezing wind rattling the windows and rain pattering on the roof. What on earth can scuba divers do in these circumstances? Well browsing the Scuba Doctor's dive site webpages is on...
by packo
Mon, 21 Jun 2021 5:36 pm
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Packo Slack Water Tables -2021
Replies: 15
Views: 16962

Re: The Packo Slack Water Tables -2021

Hi, The July to September 2021 "packo predictions" for Port Phillip Heads are now available from the updated links at the top of the original post. Next expected 3 monthly update (October --> December 2021) will be around the 22nd of September 2021. Gee the Covid-19 virus is still smashing...
by packo
Fri, 28 May 2021 12:42 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: Uphill Tidal Flow Through Port Philip Heads - Are You Kidding Me?
Replies: 0
Views: 3992

Uphill Tidal Flow Through Port Philip Heads - Are You Kidding Me?

***** Uphill Tidal Flow Through Port Philip Heads ***** No kidding at all! It does happen - for about the last 40 to 80 minutes before slack water. This "last run" of the tidal flow is going uphill, and against a growing uphill slope! Before the words "no-way" escape your lips, ...
by packo
Fri, 28 May 2021 12:32 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Equal Levels Moment
Replies: 0
Views: 3936

The Equal Levels Moment

***** The Bass Strait/Port Phillip Bay "Equal Levels" Moment ***** The equal levels moment at Port Phillip Heads occurs roughly every 6 hrs when the "outside" ocean water level matches the "inside" water level in the vast "main body" of the Bay. The "mai...
by packo
Fri, 28 May 2021 12:30 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Reverse Level Difference at Slack Water
Replies: 0
Views: 4159

The Reverse Level Difference at Slack Water

***** Forward and Reverse Slopes in the Sea Surface Near Port Phillip Heads ***** Over each cycle of tidal flow, the level differences between Bass Strait tides and the delayed (and smaller) tides in the large "main body" of the Bay create both long duration "downhill slopes", a...
by packo
Fri, 28 May 2021 12:01 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Slack Water Period
Replies: 0
Views: 4236

The Slack Water Period

****** The "Slack Water Period" ****** One unfortunate consequence of the official "Little White Lie" is the belief that "slack water" has an extended period of no water movement. Scuba divers know this is misleading and with careful observation the current reversal ca...
by packo
Thu, 27 May 2021 11:59 pm
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Momentum Of Tidal Streams
Replies: 0
Views: 3992

The Momentum Of Tidal Streams

***** Water Momentum in Port Phillip Bay's Tidal Streams ***** Like everything else with mass, moving water has momentum. In Port Phillip Bay, circumstances have conspired to make the effect of the momentum of the tidal streams quite significant. Unfortunately the changes of tidal stream behaviour ...
by packo
Thu, 27 May 2021 11:51 pm
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Bay's "Balance Line"
Replies: 0
Views: 3927

The Bay's "Balance Line"

***** Port Phillip Bay's "Balance Line" ***** Many yacht skippers, fishing folk, some scuba divers, and even marine authorities subscribe to the simple idea that slack water at Port Phillip Heads after a flood tide occurs at the same time as high tide at Williamstown at the northern end o...
by packo
Sat, 17 Apr 2021 1:38 am
Forum: Scuba Doctor Dive Maps
Topic: Finding the...
Replies: 3
Views: 5200

Re: Finding the...

Hello, With regard to recent updates to the Hurricane dive site page, I make these comments:- --------------- Wreck Site Sketch The link to the "Dive Site Information Sheet" pdf file, and its wreck site sketch that initially displayed on the SDoc site:- https://i.ibb.co/71Y4ZvP/Hurricane-s...
by packo
Sun, 11 Apr 2021 11:56 am
Forum: Scuba Doctor Dive Maps
Topic: Bass Strait Warning
Replies: 4
Views: 3699

Re: Bass Strait Warning

Hello, Not sure if this post really belongs in this thread, but it all started when I clicked on Lloyd's link to the Casino Wreck dive site page from his post above. Initially this was to read the new "Bass Strait Warnings" text. This seems a worthwhile thing to do. My attention then drift...
by packo
Thu, 08 Apr 2021 1:03 am
Forum: Scuba Doctor Dive Maps
Topic: Mystery GPS Marks
Replies: 2
Views: 3201

Re: Mystery GPS Marks

Hello, "Mystery Marks"? Who doesn't like a mystery? Lloyd's burst of Good Friday posts are in part concerned with weeding his dive site database of bogus or mystery GPS marks. That is indeed a worthwhile endeavour but is getting harder as the database is growing fast! Packo's very long &qu...
by packo
Mon, 22 Mar 2021 11:36 am
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: The Packo Slack Water Tables -2021
Replies: 15
Views: 16962

Re: The Packo Slack Water Tables -2021

Hi, The April to June 2021 "packo predictions" for Port Phillip Heads are now available from the updated links at the top of the original post. Next expected 3 monthly update (June --> September 2021) will be around the 22nd of June 2021. Hope you have all enjoyed getting back to sort of &...
by packo
Sun, 03 Jan 2021 2:35 pm
Forum: Port Phillip Heads Slack Water - Packo Predictions
Topic: Minor Moon Times glitch: BoM 2021 RIP predictions
Replies: 0
Views: 4317

Minor Moon Times glitch: BoM 2021 RIP predictions

Only barely worth a mention but the 2021 RIP predictions on the BoM website (and the linked *.pdf file) have Moon Phase dates mostly 1 day too early. The relevant BoM folk are now aware of this minor glitch. Probably they won't be fixing it since this (mis)information has been in the public domain s...