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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Running Aground
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


Thread: Running Aground Reply to Thread
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Topic Review (Newest First)
03-29-2008 06:48 PM
sanctuarysam
as i've said before...

much like 'bikers', there are two types of bikers, those who have dropped their bikes, and those who haven't dropped it yet. and when 650+ lbs of hot motorcycle falls...can be painful. yes..i have dropped my bike.
i've been sailing all my life..and have been aground soft and many a hard grounding (actually sailed into a hole at the mouth of the piankatank in '78), near gwynns island..early january..imagine cold and confounding. old farts cg aux had to pull me off (ugh..and there were young women on board too)
as said above, the sounder is a retrospective device..by the time you see that it is too shallow, you are probably already bumping..fast spin around, if possible ("GYBE HO!!!) and hope i don't spill my bass ale
03-29-2008 10:25 AM
tjaldur We have a saying that the depthsounder is only of historical interest. Assuming that the swinger is 2 m. before the keel, then sailing at the speed of 4 knots, it will take 0,5 seconds from the moment one have the information from the instrument to the moment of truth.

I have only one explanation for my groundings, sloppy chartreading.
03-29-2008 09:40 AM
SURV69
I Expect To Run Aground

If I religiously follow the charts of Lake Erie.

The charts are based on some obscure, probably made-up low water datum with the average depth of water being 4 feet above datum and high water marks almost a foot above that.

MY new(old), boat draws 4 feet.

ACCORDING to the charts, since the depths are based on "low water datum", shouldn't I be able to take my boat ANYWHERE THAT THE CHARTS SHOWS WATER existing?

The idea of using low water datum is that a 4' depth would for all intensive purposes, be some number of feet deeper(like a "safety" margin). In this case, 4 feet deeper. ANYPLACE on the chart that shows 1 foot of depth, should mean I can transit that route safely, which is plain and simple, just not true. In fact I know of many places which is shown as 1 or even 2 feet depth, where the smallest of boats(planing hulls) get stuck on the bottom all the time.

REALISTICALLY . . . shouldn't any place which has a depth of less than 3-4 feet(real-time actual depth), actually be shown as uncoverings or dry-land on the chart . . . or at the very least, a color-change exist at the lake bottom(average depth) where the low-water datum would meet the air?

THIS seems to be especially critical to me since my draft is the same as the difference in real-time depth and low-water datum.
03-12-2008 11:40 PM
sanctuarysam
heeeeyyyyy

Quote:
Originally Posted by Boasun View Post
Then they must be laughing maniacally at the apparent "negative IQ" of the boat owners.
i'd like to think i have at least a room temperature IQ.
03-12-2008 07:20 PM
sailingdog PBzeer-

I think he's figured that out now.

Jr-

If you thought it was a place that raw sewage was discharged, wouldn't you want to avoid it anyways... or do you really like sailing in xxxx??
03-12-2008 06:22 PM
PBzeer Nope, that's where they dump what they dredge up
03-12-2008 06:13 PM
jr438234606 Ran aground, in a shipping lane, at night, in 20 Knot winds, with all sails fully deployed, in the rain, and with at least 5ft seas. Hit a "Spoil" area. Thought "Spoil" meant it was merely a place that raw sewerage was discharged. Duh.
03-12-2008 12:24 PM
Boasun
Quote:
Originally Posted by GBurton View Post
These were service mechanics....
Then they must be laughing maniacally at the apparent "negative IQ" of the boat owners.
03-12-2008 11:29 AM
GBurton These were service mechanics....

Quote:
Originally Posted by Boasun View Post
Hey the mechanics have a steady job from poor navigators who bounce off of everything out there. You would think that they would love them.
03-11-2008 11:23 PM
craigtoo
Quote:
Originally Posted by sailingdog View Post
I think it is an all too common mistake to think that the icon on the screen of your chartplotter has anything to do with the reality of where your sailboat is. It doesn't. Using it as the sole navigation device is a bad idea. The icon on the chartplotter is an approximate representation of where electronic satellites are telling this black box where your boat is, set against an interpretation of reality by a cartographer who may or may not have been stoned while creating the chart, based on data that may be 100 years out of date. YMMV.
Amen brother....had a big head slapping moment there when I realized.. Ooooh *THAT'S* what that Giant circle means around the little triangle when I'm zoomed all the way in...heh

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