understanding maps question

breadcatcher101 · 11-01-08, 07:19 PM

Thanks for explaining that for me. Always wondered about that one.

I'm goin' down · 11-02-08, 04:47 AM

I did not understand Mannhausen's post. I am missing something basic I think.

Nisgeis · 11-02-08, 05:11 AM

Quote:

Originally Posted by I'm goin' down

I did not understand Mannhausen's post. I am missing something basic I think.

If you want to plot a course due North, or a course of 000, then you'd drag your plot course line straight up, and therefore the plot line would run through the bottom of the bearing circle, so for you to plot 000, the bottom part must be 000.

Likewise, to plot a course East or 090, then you drag the line to the right and the line between the plot point and the submarine goes through the left of the bearing circle, so it should be labelled as 090 to correctly plot a course.

Munchausen · 11-02-08, 11:18 AM

To illustrate:

Plotting your course ...

As in Nisgeis' example, you've set a course to the north using the navigator's compass. Since the course line only extends to the center of the compass rose, your true heading must be read along the back side.

Taking a target bearing ...

True bearing to the target is about 307 degrees ... again measured on the back side.

Measuring target heading ...

This is the easiest method to plot your target's course ... anchor the line on your first fix, drag the compass over the target, then read the back side (in this case, about 089 degrees). If you like, you can also enter this target heading into the TDC by adjusting AOB.

I'm goin' down · 11-02-08, 12:01 PM

I'm goin' down wants to introduce you to a couple of city gals and take you to dinner when your boats are in town (San Francisco), a great port town. Thanks. I could have never figured that one out!

Munchausen · 11-03-08, 11:04 AM

Quote:

Originally Posted by I'm goin' down

I could have never figured that one out!

:hmm: I could never figure out San Francisco. Tried going to a dinner party in Twin Peaks once ... and ended up on Fisherman's Warf.

Too many one-way streets ... scary when you turn a corner and see three or four rows of headlights coming your way.

11-02-08, 04:47 AM	#2
I'm goin' down Ocean Warrior Join Date: Sep 2008 Location: Notify command we have entered the Grass Sea Posts: 2,822 Downloads: 813 Uploads: 0	I don't understand? I did not understand Mannhausen's post. I am missing something basic I think. Last edited by I'm goin' down; 11-02-08 at 04:48 AM.

11-02-08, 11:18 AM	#4
Munchausen Commodore Join Date: Jul 2002 Posts: 608 Downloads: 25 Uploads: 1	To illustrate: Plotting your course ... As in Nisgeis' example, you've set a course to the north using the navigator's compass. Since the course line only extends to the center of the compass rose, your true heading must be read along the back side. Taking a target bearing ... True bearing to the target is about 307 degrees ... again measured on the back side. Measuring target heading ... This is the easiest method to plot your target's course ... anchor the line on your first fix, drag the compass over the target, then read the back side (in this case, about 089 degrees). If you like, you can also enter this target heading into the TDC by adjusting AOB. Last edited by Munchausen; 11-02-08 at 11:20 AM.

11-02-08, 12:01 PM	#5
I'm goin' down Ocean Warrior Join Date: Sep 2008 Location: Notify command we have entered the Grass Sea Posts: 2,822 Downloads: 813 Uploads: 0	I got it I'm goin' down wants to introduce you to a couple of city gals and take you to dinner when your boats are in town (San Francisco), a great port town. Thanks. I could have never figured that one out!

11-01-08, 07:19 PM	#1
breadcatcher101 Captain Join Date: Sep 2008 Location: Southeastern USA Posts: 546 Downloads: 1 Uploads: 0	Thanks for explaining that for me. Always wondered about that one.