NADIR Polar Function

[Kimi_uy]

The manual vaguely mentions this feature and how it's supposed to work.

I assume that this is used to create offset waypoints from the selected waypoint. If this is the case this would come in handy for finding coordinates of a target picked up by the Vivianne.

 

Is it HDG and then Distance in Km?

 

 

Any ideas/insights?

[Ramsay]

I assume that this is used to create offset waypoints from the selected waypoint.

 

I wish it was use like that, however AFAIK it is an alternative way of creating a new way point by using the relative positions of two existing NADIR way points as reference.

 

If this is the case this would come in handy for finding coordinates of a target picked up by the Vivianne.

AFAIK the NADIR is modelled with it's real functions/limitations, so like the real pilot/commander we need to work target coordinates out using our position, bearing/distance to target and map read, etc.

[Kimi_uy]

Ok thanks. Can you elaborate on how to use it?

[Ramsay]

Ok thanks. Can you elaborate on how to use it?

 

The most important thing to understand is the polar copy function takes waypoint numbers NOT bearings and distance.

 

I don't know how it's used by real pilots but I can give an example of how it functions.

 

Lets say I want to fly from Batumi to Tbilisi-Lochini (281km @ 76° Magnetic, 82° True) with a series of intermediate waypoints along the route with 25 km spacing.

 

Waypoint 1 (at Batumi) and Waypoint 2 (25km @ 76° Magnetic) are entered by hand (or created using the mission editor and the special tab function).

 

The 3rd and subsequent waypoints can then be created using the NADIR polar function to reference the first two without the need enter lots of individual coordinates.

 

Create WP1 and WP2 and set the NADIR to BUT (goal/waypoint)

WP1 N 41° 36.5' E 41° 36.0'

WP2 N 41° 37.2' E 41° 54.0'

Creating a new waypoint using existing data

1. Copy the relative polar coordinates/position of WP1 and WP2,

 

 

 

• 
  
• POL, 1, 2, GEL
  

2. then using WP2 as starting reference, write the data to WP3

 

• 
  
• 2, 3
  

3. and save

 

• 
  
• ENT
  

Waypoint 3 has now been created 25km @ 76° Magnetic beyond waypoint 2 (so is 50km from WP1/Batumi).

 

The method can be repeated to create additional waypoints 4, 5, 6, etc. along the route but it's probably more sensible to just update WP3 as you get near/pass it.

 

Updateing an existing waypoint using existing Polar data

1. Copy the relative polar coordinates/position of WP1 and WP2,

 

 

• 
  
• POL, 1, 2, GEL
  

2. then using WP3 as starting reference, write the update data to WP3

 

 

• 
  
• 3, 3
  

3. and save

 

 

• 
  
• ENT
  

Waypoint 3 has now been updated 25km @ 76° Magnetic beyond it's original position.

 

• 
  
• 1st update is 75km from WP1/Batumi
  
• 2nd update is 100km from WP1/Batumi, etc.
  

Edited July 17, 2016 by Ramsay
Correct bearings as F10 y axis = true for the Gazelle's instruments

[Kimi_uy]

Ohhh OK, so that's how it works. Thanks a lot :)

 

Would this work too? With 3' being the updated wypt 3.

[Ramsay]

Would this work too? With 3' being the updated wypt 3.

AFAIK that will work and you understand how the Polar function works.

[Kimi_uy]

AFAIK that will work and you understand how the Polar function works.

Awesome, thanks again. Now it's time to find out what it's useful for.

[ESAc_matador]

Not very... With the ME but one day it could be helpfull. (Navigating IFR in long hauls for instance)

[Ramsay]

Perhaps ?