Jump to content
Search In
  • More options...
Find results that contain...
Find results in...

Recommended Posts

I have looked and looked.  If you can find an old fishing hot spots map, they had the TD's on them.  Funny thing is, a lot of fisherman don't even know what TD's are.  We use TD's extensively here in the eastern basin.  I know I may get hammered for this, but Bill Saiff III introduced me to the system and how it aligns perfectly with the structure of the eastern basin of Lake Ontario.  Furuno GP-39's will overlay TD's and give you your numbers too.

  • Like 1

Share this post


Link to post
Share on other sites
5 minutes ago, wallyandre said:

Can I ask? What are TD's

Me too, what are they?

 

thanks
 

John

Share this post


Link to post
Share on other sites

TD is Time Difference and goes back to the LORAN C system used prior to GPS.  LORAN was based on radio transmitters and was “turned off” quite a while ago.

Share this post


Link to post
Share on other sites
11 minutes ago, mr 580 said:

TD is Time Difference and goes back to the LORAN C system used prior to GPS.  LORAN was based on radio transmitters and was “turned off” quite a while ago.

Thank you

Share this post


Link to post
Share on other sites

When the military went to GPS then the LORAN network was not maintained and eventually was phased out.  One of the main radio towers was at Sampson.  GPS is faster and more accurate.  My guess is you would need to find old paper charts to get TD lines.  I had a LORAN unit and they would get you back - however GPS much more reliable.

Share this post


Link to post
Share on other sites
3 hours ago, guffins fisherman said:

I have looked and looked.  If you can find an old fishing hot spots map, they had the TD's on them.  Funny thing is, a lot of fisherman don't even know what TD's are.  We use TD's extensively here in the eastern basin.  I know I may get hammered for this, but Bill Saiff III introduced me to the system and how it aligns perfectly with the structure of the eastern basin of Lake Ontario.  Furuno GP-39's will overlay TD's and give you your numbers too.

As a commercial fisherman for almost 40 years here in Maine. TDs are what we always have used for the same reason Bill S mentioned.

Share this post


Link to post
Share on other sites

guffins,

Many of the plotters we use have the ability to overlay TDs on the charting screen. This is much more useful then lat long on many levels. I will dig a little deeper into my Garmin Ultra to see if that feature is offered.

Share this post


Link to post
Share on other sites
Posted (edited)

One of the problems with the LORAN system was that if you were too close and in line with a tower the signal could be either lost or corrupted because it depended on triangulation among three towers for best accuracy. My old unit used to have the problem big time on Seneca near Sampson.

Edited by Sk8man

Share this post


Link to post
Share on other sites

As far as I know, Lowrance will not do it. I cannot find it on my Garmin Echomap Plus. Maybe the higher end plotters will do it. It would be interesting to see a list of machines that will do it.

guffins,
Many of the plotters we use have the ability to overlay TDs on the charting screen. This is much more useful then lat long on many levels. I will dig a little deeper into my Garmin Ultra to see if that feature is offered.


Sent from my moto z3 using Lake Ontario United mobile app

Share this post


Link to post
Share on other sites

I have the Nobel Tec Time Zero Explorer I use on commercial vessels for scallop fishing and the option to lay TDs over the charts are on that program. I have not checked on my Garmin yet

Share this post


Link to post
Share on other sites

Something like this?

Map.jpg

Share this post


Link to post
Share on other sites

If you have no way to reference TD’s why would you want them?

I do have some logs from many moons ago I copied of my King LORAN, but I only used them for scuba diving points.


Sent from my iPhone using Lake Ontario United mobile app

Share this post


Link to post
Share on other sites
21 hours ago, Terp said:

Something like this?

Map.jpg

Yes just like that. I stopped by West Marine today in Watertown but the charts they had did not have TDs

Share this post


Link to post
Share on other sites
Posted (edited)
17 hours ago, scobar said:

If you have no way to reference TD’s why would you want them?

I do have some logs from many moons ago I copied of my King LORAN, but I only used them for scuba diving points.


Sent from my iPhone using Lake Ontario United mobile app

I fished commercially for over 30 years using TDs because of reasons mentioned above the 12000 line on the 9960 chain follows the edge of the bottom almost perfectly, and many guys still reference areas to fish in TDs

Edited by Scalloper 1

Share this post


Link to post
Share on other sites

Scalloper -  I have a book full of these charts for different sections of the lake. Let me get home and I'll message you the name of the book and publisher.

 

Share this post


Link to post
Share on other sites

This isn't going to be of any help......... can't find this publication anywhere....

you might want to try online at Seabreeze nautical Books and Charts - Great Lakes maps

SWT Cover.jpg

Seaway Trail.jpg

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...