On the PPI scope, what do the three different lines represent?

LukeFF · 04-02-07, 07:50 PM

On the PPI scope, what do the three different lines represent? It looks like the top one is for range and the last two are for bearing. Is this right?

LukeFF · 04-04-07, 02:56 AM

Quote:

Originally Posted by LukeFF

On the PPI scope, what do the three different lines represent? It looks like the top one is for range and the last two are for bearing. Is this right?

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Sgian Dubh · 04-09-07, 12:13 PM

I think there is confusion here, perhaps on my part. The PPI in "PPI scope" stands for "Plan Position Indicator". The PPI scope is associated with the (I thought) surface-search RADAR.

The three lines on the screen (that I have seen) were on the air-search RADAR. Or am I mixing too much SH1 with SH4?

The Air-search RADAR should only show strength and range, not vector.

The three lines are differenct range settings for the air-search radar (at least that is what I thought). Some one please correct me if I have this wrong....

heartc · 04-09-07, 01:00 PM

I don't know about SHIV, since I've not yet in a boat with PPI scope, however at least in SHI the PPI scope was simply presenting a 360° radar sweep with your sub in the center. You could put the radar beam on scan or "fix" it on a given direction.

akdavis · 04-09-07, 03:28 PM

1. Only surface search radar has a display. If you are equipped only with SD air search radar, neither radar display will be functioning. (However, I believe some surface search radar in the game incorrectly returns air contacts.)

2. The buttons on the toolbar to jump to a display are reversed. The "clock face" display is PPI, while the "heart monitor" display is A-scope. The PPI display (think classic movie radar) was developed later in the war and appears to be available too early in game. For the majority of the war, radar used an A-scope type display.

The A-scope represents a slice of radar energy directed down the axis of the radars current facing (rotate radar manually with the HOME and END keys). The three lines represent different range scales (from the top: short, medium, long beginning) and the numbers on the lines are the range in hundreds of yards (or maybe meters considering the state of the game).

You can change the active range display by toggling one of the switches beneath the display. You determine bearing by rotating the radar until you see a contact. (But here the game is lame and you are not given any indication of bearing on the display.) Contacts are represented by "spikes" in the horizontal flat lines. The height of the spike is an indication of the size of the contact (or at least I think it is). Where this spike occurs along the active line is an indication of range.

C-4 · 04-09-07, 04:46 PM

I don't know about the SJ giving air contacts, but my 1941 SD is giving me directional surface contacts. I kinda like this bug though. It just helped me find a 2-destroyer TF patrolling in a straight line, when I spent something like 4 torpedoes and 5 shells to destroy just 1.

heartc · 04-09-07, 04:49 PM

Quote:

Originally Posted by akdavis

(However, I believe some surface search radar in the game incorrectly returns air contacts.)

It is vise-versa: The surface to air radar (SD) returns also surface contacts. Not with exact range, but with exact bearing and "short/medium/long" range information. That's quite a biggy, since it took the subs a while to get surface search radar, while SD was available from early on and is so in the game. Also, SD was only capable of providing range to air contacts, not bearing.

04-09-07, 12:13 PM	#3
Sgian Dubh Officer Join Date: Sep 2002 Posts: 245 Downloads: 0 Uploads: 0	I think there is confusion here, perhaps on my part. The PPI in "PPI scope" stands for "Plan Position Indicator". The PPI scope is associated with the (I thought) surface-search RADAR. The three lines on the screen (that I have seen) were on the air-search RADAR. Or am I mixing too much SH1 with SH4? The Air-search RADAR should only show strength and range, not vector. The three lines are differenct range settings for the air-search radar (at least that is what I thought). Some one please correct me if I have this wrong.... __________________ \"One ping to find them all, One ping to link them; One ping to promote them all, and in the darkness sink them.\" with apologies to J.R.R. Tolkien

04-09-07, 03:28 PM	#5
akdavis Samurai Navy Join Date: Mar 2005 Location: Fort Worth, Texas Posts: 597 Downloads: 0 Uploads: 0	1. Only surface search radar has a display. If you are equipped only with SD air search radar, neither radar display will be functioning. (However, I believe some surface search radar in the game incorrectly returns air contacts.) 2. The buttons on the toolbar to jump to a display are reversed. The "clock face" display is PPI, while the "heart monitor" display is A-scope. The PPI display (think classic movie radar) was developed later in the war and appears to be available too early in game. For the majority of the war, radar used an A-scope type display. The A-scope represents a slice of radar energy directed down the axis of the radars current facing (rotate radar manually with the HOME and END keys). The three lines represent different range scales (from the top: short, medium, long beginning) and the numbers on the lines are the range in hundreds of yards (or maybe meters considering the state of the game). You can change the active range display by toggling one of the switches beneath the display. You determine bearing by rotating the radar until you see a contact. (But here the game is lame and you are not given any indication of bearing on the display.) Contacts are represented by "spikes" in the horizontal flat lines. The height of the spike is an indication of the size of the contact (or at least I think it is). Where this spike occurs along the active line is an indication of range. __________________ -AKD

04-02-07, 07:50 PM	#1
LukeFF Silent Hunter Join Date: Apr 2005 Location: Riverside, California Posts: 3,610 Downloads: 41 Uploads: 5	On the PPI scope, what do the three different lines represent? It looks like the top one is for range and the last two are for bearing. Is this right?

04-09-07, 01:00 PM	#4
heartc Samurai Navy Join Date: Dec 2006 Location: Munich Posts: 562 Downloads: 71 Uploads: 0	I don't know about SHIV, since I've not yet in a boat with PPI scope, however at least in SHI the PPI scope was simply presenting a 360° radar sweep with your sub in the center. You could put the radar beam on scan or "fix" it on a given direction.

04-09-07, 04:46 PM	#6
C-4 Watch Join Date: Aug 2006 Location: Somewhere in the universe Posts: 30 Downloads: 0 Uploads: 0	I don't know about the SJ giving air contacts, but my 1941 SD is giving me directional surface contacts. I kinda like this bug though. It just helped me find a 2-destroyer TF patrolling in a straight line, when I spent something like 4 torpedoes and 5 shells to destroy just 1.