Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > Marine Electronics Forum
Reload this Page >

Garmin 7612 xsv autoguide led me aground

Notices
Marine Electronics Forum

Garmin 7612 xsv autoguide led me aground

Old 10-17-2017, 10:43 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default Garmin 7612 xsv autoguide led me aground

I put in a waypoint, and then chose "navigate to" which uses the autoguide feature. I was going to a marina in Key Biscayne FL at that waypoint. The unit plots out a purple line, which I followed exactly. When going through government cut, towards the port of miami, you can veer left through "Fisherman's channel", which is the backside of the port of miami. The garmin led me out about 300 yards away from the port wall, instead of hugging the wall of the port. I ran aground in less then a foot of water. Ok, I am an idiot I ended up damaging my props. I was under the (obviously false) impression that the autoguide feature took into account safe navigable depth in plotting its course. It did not, and I can no longer trust that feature of the unit any more. Not good. I am guessing at this point, I will have to manually plot a course of safe navigable waypoints first, and then create a route from that. Is there some setting on the unit that will tell it "when using autoguide, do not plot a course through water less than 5 feet" ?
Dave
Old 10-17-2017, 10:52 AM
  #2  
Admirals Club Admiral's Club Member
 
Join Date: Jul 2006
Location: Ocala
Posts: 3,118
Received 887 Likes on 453 Posts
Default

Originally Posted by daveddd View Post
I will have to manually plot a course of safe navigable waypoints first, and then create a route from that. Is there some setting on the unit that will tell it "when using autoguide, do not plot a course through water less than 5 feet" ?
Dave
Dave,
I have found the Auto Guide to fine but not so much in tight areas. Did you have the draft of your boat entered into the unit when you first got it? Mine is set to 8" to accommodate tide swing. When it sets a route I get warnings that there are hazards. At that point it is me only on the helm. I'm not really sold on auto routing as things change too much on the water. Its good for a reference in unfamiliar waters but not a substitute for loose nut behind the wheel.

I will also say that creating your own routes is a much better option overall. Not fool proof but better than letting a machine do it for you.
Old 10-17-2017, 10:57 AM
  #3  
Admirals Club Admiral's Club Member
 
Join Date: Jun 2013
Location: Hampton, VA
Posts: 338
Received 88 Likes on 47 Posts
Default

Sorry you ran aground. Yes there is a minimum depth setting for auto guidance. I have used it before with good success but I never run the route without verifying the route depths first. It is usually good but it does do weird things at times. It will bypass some markers at times to save time/distance if the water depths are above your minimum set. I believe I am using Auto Guidance 3.0? as I have a 2017 Vision HD chart with an updated version of Auto guidance on it.

Scott
Old 10-17-2017, 11:06 AM
  #4  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks Moose. I will have to look for the setting that sets the minimum draft. I have a Pursuit S280 Sport 28 foot center console, so will have to verify what the setting should be for that. I need to take a navigation course!
Old 10-17-2017, 11:07 AM
  #5  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks - I will look for the setting on the unit which set the minimum draft for auto guidance. I need to take a course in navigation.
Old 10-17-2017, 11:57 AM
  #6  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Moose
My boat has a 34" draft with engines down. Regarding your 8" tide swing response should I add 8" to that = 42" when I enter my draft into the unit?
Dave
Old 10-17-2017, 04:23 PM
  #7  
Admirals Club Admiral's Club Member
 
Join Date: Jul 2006
Location: Ocala
Posts: 3,118
Received 887 Likes on 453 Posts
Default

I would just enter 8 feet and that should help. Just remember it is Auto "guidance" not a track you run blind with. If it is showing you to bypass markers..... don't

Save the extra cost of the Fantom and upgrade down the road when Garmin comes out with a hybrid pulse, broadband unit.

Last edited by kmoose; 10-17-2017 at 04:34 PM.
Old 10-17-2017, 04:36 PM
  #8  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

yes, and I really to learn what all the markers mean on a map.
Old 10-17-2017, 04:50 PM
  #9  
Admirals Club Admiral's Club Member
 
Join Date: Mar 2012
Location: CT
Posts: 1,599
Received 296 Likes on 184 Posts
Default

As it was explain to me "maps tell you where you can go and charts tell you where not to go"

If nothing else pick up a copy of Chapman seamanship and boat handling. Highly recommend a USCGA boat skills and seamanship class.
Old 10-17-2017, 04:51 PM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location: Falmouth, MA
Posts: 5,844
Received 498 Likes on 321 Posts
Default

forget the autoguidance and learn how to read your charts and plot a course
Old 10-17-2017, 04:54 PM
  #11  
Senior Member
 
Join Date: Apr 2010
Location: Sarasota, FL
Posts: 2,891
Received 303 Likes on 158 Posts
Default

Originally Posted by chainsaw42 View Post
forget the autoguidance and learn how to read your charts and plot a course
Haha I was waiting for that.
Old 10-18-2017, 10:24 AM
  #12  
Senior MemberCaptains Club Member
 
Join Date: Feb 2003
Location: M.Vineyard, MA
Posts: 14,783
Received 616 Likes on 464 Posts
Default

I believe most of the manuals for electronic marine navigational devices which provide an auto-guide /auto-routing function have a disclaimer essentially saying the function is meant to help save time by providing suggested waypoints in route sequence, but that it is the responsibility of the vessel operator to confirm the included WPs allow for passage over safe waters. Keep in mind , in some cases the charting itself may not be correct to begin with.

And as others point out , you have to set up the system to recognize potentially unsafe depths ( at extreme low tide) for your vessel.

Never use auto-routing without carefully examining where the route would take you, even if you feel you have set up the system to avoid navigational hazards. Ultimately all navigational decisions , including whether to follow a "suggested" route, are up to the operator in a case like this.

Sorry to hear you ran aground . Hope the props are repairable and hull & transducers are still good.
Old 10-18-2017, 11:22 AM
  #13  
Junior Member
Thread Starter
 
Join Date: Jun 2017
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by TTaxi View Post
I believe most of the manuals for electronic marine navigational devices which provide an auto-guide /auto-routing function have a disclaimer essentially saying the function is meant to help save time by providing suggested waypoints in route sequence, but that it is the responsibility of the vessel operator to confirm the included WPs allow for passage over safe waters. Keep in mind , in some cases the charting itself may not be correct to begin with.

And as others point out , you have to set up the system to recognize potentially unsafe depths ( at extreme low tide) for your vessel.

Never use auto-routing without carefully examining where the route would take you, even if you feel you have set up the system to avoid navigational hazards. Ultimately all navigational decisions , including whether to follow a "suggested" route, are up to the operator in a case like this.

Sorry to hear you ran aground . Hope the props are repairable and hull & transducers are still good.
Thanks - I am taking a Coast Guard Auxilary navigation course starting this weekend. I do not wish to be an idiot anymore
Old 10-18-2017, 11:28 AM
  #14  
Admirals Club Admiral's Club Member
 
Join Date: May 2007
Location: Ray City, GA
Posts: 1,130
Received 197 Likes on 100 Posts
Default

I use auto guide to get a 'rough' course. I then go along the course and make manual adjustments/corrections. Sometimes it does some plain whacky stuff. I've seen it want leave an ICW marked channel make a 90deg stbd turn, go around a submerged island (marsh) and then some back into the ICW channel on the other side.... Not only was the whacky route longer, but it would have grounded anything but a paddleboard lol.

to the makers of auto guidance software: Personally I think auto guidance should pretty much keep you in the navigable channel if it is reasonable. Too many times it cuts corners only to bring you within feet of buoys and points/shoals.

That being said it is a good tool to get a base route set, but like any machine/program it shouldn't be trusted as the gospel.
Old 10-18-2017, 01:19 PM
  #15  
Senior Member
 
Join Date: Apr 2010
Location: Sarasota, FL
Posts: 2,891
Received 303 Likes on 158 Posts
Default

Originally Posted by daveddd View Post
Thanks - I am taking a Coast Guard Auxilary navigation course starting this weekend. I do not wish to be an idiot anymore
Well, for me being an idiot is not optional. The CG course is a good start. They go a little overboard but are always happy to talk to you. Might even find a few that wld b happy to impart some local knowledge.
Old 10-19-2017, 11:37 AM
  #16  
Senior Member
 
Join Date: Mar 2015
Location: Cedar Point, OH, Miami, FL
Posts: 984
Received 250 Likes on 180 Posts
Default

I haven't had much look with this particular "sermon", but I'll keep trying because I really think it's worthwhile:

Garmin provides a free computer-based plotting program available for Mac and PC called Homeport. You can download the program on the computer, then get an SD card and copy the built-in maps and tracks from your 7612.

Homeport will look to your SD card for the maps, so this is all free. Study your tracks for bad habits that you may not have known you had, then build safe and familiar routes based on your safe habits. Then you can upload them back into the unit with much more confidence.

I like to place waypoints at common / frequent positions, name them how I want and use them as a foundation for new routes. For example, it sounds like you were traveling wb in Fisherman's looking to turn south into East Pass? You could make a WP above that called "East Pass N Entry", and use it for both west and eastbound routes to it.

Bluechart Mobile is an option too, but I tend to use that more on-the-fly than as a serious or high-volume method of plotting courses
Old 10-19-2017, 12:19 PM
  #17  
Senior MemberCaptains Club Member
 
Join Date: Jun 2003
Location: Mistersippi
Posts: 2,588
Received 1,561 Likes on 858 Posts
Default

Originally Posted by chainsaw42 View Post
forget the autoguidance and learn how to read your charts and plot a course
Real men use a sextant.
Old 10-19-2017, 01:09 PM
  #18  
Senior Member
 
Join Date: Jun 2015
Location: Chicago
Posts: 138
Likes: 0
Received 9 Likes on 5 Posts
Default

I will add, the autoguide feature cannot avoid objects or obstructions that are not on the chart as such. For example, the garmin charts show the "cribs" (giant water pump houses) off of Chicago in Lake MI, but autoguide will plan a route and drive your boat straight through them if you let it for some reason.
Old 10-19-2017, 01:26 PM
  #19  
Admirals Club Admiral's Club Member
 
Join Date: Dec 2011
Location: Beach Haven/ Islamorada
Posts: 2,631
Received 341 Likes on 193 Posts
Default

Originally Posted by daveddd View Post
Thanks - I am taking a Coast Guard Auxilary navigation course starting this weekend. I do not wish to be an idiot anymore
Oh, shit..then you should be ready to go anywhere. lol just kidding.

Note...there can also be variance in the chartplotter versus the actual location. So while on the chart you are fine..in actuality you are 20 feet off..and in boating like football , it's a game of inhces. Just ask the unappreciative for what they have football players.
Old 10-20-2017, 05:46 AM
  #20  
Senior Member
 
Join Date: Mar 2015
Location: Cedar Point, OH, Miami, FL
Posts: 984
Received 250 Likes on 180 Posts
Default

Originally Posted by daveddd View Post
Thanks - I am taking a Coast Guard Auxilary navigation course starting this weekend. I do not wish to be an idiot anymore
I'm a life-long boater. I took the CGA course as an adult as a way to pass time in the winter and meet up with marina friends that I wouldn't otherwise see until spring. As an "experienced, life-long boater", I didn't expect to learn anything. I knew some of the instructors. They had small boats and didn't take them very far.

I learned all kinds of stuff! I had no idea how much I didn't know. (which likely means I still don't)

Fisherman's is actually very well-marked. If I understand where you grounded (and IF you get good CGA instructors), the next time you pass through there, you'll look at markers and say "ohhhhhh".

This is the only pic I have of the area and this is the best I could crop it, but I'm thinking you were just west of me, when you put those greens to your stbd? I bet by Sunday night you'll look at this pic and have your "ohhh".


Last edited by RollerCoastr; 10-20-2017 at 10:22 AM.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.