Marine Electronics Forum - Garmin 2210/3210 Loran line question

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Scoutin 4 Goodies
06-01-2008, 04:22 PM
How do I display the loran lines on my garmin 2210? I know how to add the lat lon grid but I would assume there is a way to add the loran lines as well. All the old salts around here talk in loran lines offshore and I have not memorized them well enough to keep up. Tired turning the lat lon grid on in the Map menu then changed to Loran TD in the system menu. But the lat lon lines still show up.

Any ideas?

06-01-2008, 07:11 PM
I dont think that they'll show the Loran line, like the lat/laong. I've had the 2110 and now the 3210 and am not aware of this option. It would be a nice option though!

06-01-2008, 08:05 PM
You can set the 2110 and 3200 series to read like this. You won't see the grid lines on the chart but you will read TD info.

Here's a video of my 545 in the TD mode. I have my 2106 set up the same way just don't have a video of it.

Scoutin 4 Goodies
06-01-2008, 09:06 PM
Thanks Bluewater, I was hoping you would chime in. I got as far as you did with my unit but how did you know about the NAD83 and the other settings. Where would I find that info to set up my system? I think this will work if I get all the setting straight. Thanks for the help!

06-02-2008, 05:27 AM
Ive been told to use GRI 4980 for the Charleston area. I never knew about the NAD 83 settings.

06-02-2008, 07:21 AM
I do not see any way to show the loran grid on the unit as per the online manual on garmin's website. It would be very hard to develop a program that could do that seamlessly I would think, and if so the unit would be even slower....

You can certainly display loran info that the unit can convert from GPS to approximate loran C TD's. Remember these won't be very accurate as the time differences have additional secondary factors, i.e. offsets, which change depending on your exact location offshore. These displayed conversions from garmin are good enough to get you into the right areas though.

Here is how you change your unit to show loran C position:
(you do not need to change the datum or any other GPS settings. Just remember them for when you need to change back to GPS to navigate accurately!)

1)Go into main menu

2)go into system menu

3)go into units menu

4)go into position format

5)change position format to Loran TD

6)go into "Setup" in that same Loran TD pop-up menu

7)change Loran Chain Number to 7980 GRI*

8)change station 1 to Y as in yankee*

9)change station 2 to Z as in zulu*

10)save the above changes to display positions in Loran C TD's- remember old position format settings to see lat/long numbers

*these 3 steps' settings are for Charleston, SC and probably offshore anywhere from Cape Hatteras south to Miami.

IMPORTANT: Remember that this loran C position displayed is not precise but approximate... to get closely accurate, you must manually enter the offsets, which change with almost every degree of longitude and latitude that you move around on the earth's surface....

In other words, do not plug in a loran number as a waypoint and rely on the above setup to navigate there accurately/safely. It could be up to a mile off.

06-02-2008, 05:38 PM
Look on the Loran Chart of your area and it will list what Loran datum to use.

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