Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-04-2020, 09:27 AM   #1
Senior Member
 
Mark P's Avatar
 
City: Hilton Head Island
Country: United States
Vessel Model: Sea Ray 2017 280 SLX
Join Date: May 2018
Posts: 211
Navionics Chart Depth Question

Folks, I have the Navionics app on the Android phone. When I look at the depth numbers are these "low tide" numbers? I probably should have asked this question long ago
__________________
Advertisement

Mark P is offline   Reply With Quote
Old 07-04-2020, 09:28 AM   #2
Guru
 
Russell Clifton's Avatar
 
City: La Conner Wa.
Country: usa
Vessel Name: Sea Fever
Vessel Model: Defever 49 RPH
Join Date: Sep 2012
Posts: 747
Yes.
__________________

Russell Clifton is offline   Reply With Quote
Old 07-04-2020, 09:35 AM   #3
Guru
 
City: gulf coast
Country: pinellas
Join Date: Jun 2014
Posts: 3,070
mean lower low water. Not the lowest is ever gets do web search for details.
bayview is offline   Reply With Quote
Old 07-04-2020, 12:27 PM   #4
Guru
 
caltexflanc's Avatar
 
City: North Carolina for now
Country: USA
Vessel Name: Small Incentive
Vessel Model: Boston Whaler 130 Sport
Join Date: Aug 2011
Posts: 6,127
Time to get a copy of Chapman's Piloting and Seamanship and read it, cover to cover. Take some courses from your local USCG auxiliary or Power Squadron.
__________________
George

"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
caltexflanc is offline   Reply With Quote
Old 07-04-2020, 05:43 PM   #5
Guru
 
kchace's Avatar
 
City: Brookline, NH
Country: USA
Vessel Name: Blue Heaven
Vessel Model: Albin 43 classic double cabin, twin 135 Lehmans
Join Date: Sep 2013
Posts: 1,878
Quote:
Originally Posted by caltexflanc View Post
Time to get a copy of Chapman's Piloting and Seamanship and read it, cover to cover. Take some courses from your local USCG auxiliary or Power Squadron.
kchace is offline   Reply With Quote
Old 07-04-2020, 08:21 PM   #6
Guru
 
tiltrider1's Avatar
 
City: Seattle
Country: USA
Vessel Name: AZZURRA
Vessel Model: Ocean Alexander 54
Join Date: Aug 2017
Posts: 1,953
The depth marked is the amount of water at a zero tide. If your tide is -2 then you have 2 feet less than what is on the chart.
tiltrider1 is online now   Reply With Quote
Old 07-04-2020, 08:28 PM   #7
Guru
 
firehoser75's Avatar
 
City: Nanaimo
Country: Canada
Vessel Name: Pilitak
Vessel Model: Nordic Tug 37
Join Date: Feb 2018
Posts: 1,065
Except in Canada. We use a different low water datum. We almost never get a negative tide (maybe 2 times per year). Principles are the same however
__________________
Tom
Nanaimo, BC
firehoser75 is offline   Reply With Quote
Old 07-04-2020, 11:12 PM   #8
Guru
 
Rebel112r's Avatar
 
City: Birch bay wa
Country: USA
Vessel Name: Rogue
Vessel Model: North Pacific 42
Join Date: Feb 2013
Posts: 638
Maybe itís the settings I have on Navionics because the depths shown are the depths at current tide levels. If you go to a tide station and highlight it, and move the timeline left or right the depth numbers on chart change as you move left or right. At this time we have approx 9 ft of tide, if I move to zero tide the chart depths will reflect this 9 foot change. If you click off of the tide station, the indicated depths go back to the depth which reflects the tide level..For me, I like the feature.
Rebel112r is offline   Reply With Quote
Old 07-05-2020, 12:23 PM   #9
Senior Member
 
Mark P's Avatar
 
City: Hilton Head Island
Country: United States
Vessel Model: Sea Ray 2017 280 SLX
Join Date: May 2018
Posts: 211
Thank you for the reference to Chapman's - just ordered the book and look forward to reading it.
Mark P is offline   Reply With Quote
Old 07-05-2020, 01:44 PM   #10
Guru
 
Pete Meisinger's Avatar
 
City: Oconto, WI
Country: USA
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 1,377
My boat draws three and a half feet. Yesterday I motored through an area where the chart showed a depth of two feet. I still showed three feet below my keel.

Lake Michigan is at about three and a half to five feet above the high water datum. Depending on the wind, the rain, and the day.

Charts aren't all that accurate anyway.

pete
Pete Meisinger is offline   Reply With Quote
Old 07-23-2020, 12:29 PM   #11
Senior Member
 
Mark P's Avatar
 
City: Hilton Head Island
Country: United States
Vessel Model: Sea Ray 2017 280 SLX
Join Date: May 2018
Posts: 211
Just read Chapman's- great book. I now have a coffee table reference book to impress my friends!
Mark P is offline   Reply With Quote
Old 07-23-2020, 09:55 PM   #12
Senior Member
 
City: Boynton Beach, FL
Country: United States
Join Date: Jan 2016
Posts: 103
There is a feature in the Navionics app that allows you to adjust your readings based on an adjusted water level. So let's say that you live on a dam-controlled lake and the lake is 2 low right now because they dumped water in preparation for a hard rain later in the week. You can go to your app and adjust the water level by 2 feet. Since there is currently no good way for an app to have information like this, Navionics provides you a way to do it yourself. Tides are automatically accounted for since they are predictable.
__________________

cruiserChick is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 08:36 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×