HSI strange caret

[some1]

There is this caret on the HSI that is not mentioned in the manual. It only moves if there is a wind in the mission, otherwise it's pegged at 12 o'clock. 

It moves from side to side, but it doesn't seem to indicate ground track (drift) or wind direction, it's movement is rather erratic. What it's supposed to show?

[Ramsay]

1 hour ago, some1 said:

What it's supposed to show?

AFAIK it's a index that (should) indicate drift and the route followed i.e. your ground track.

Detail (translated from the ALAT SA-342 Manual)

4 AUTONOMOUS NAVIGATION

4.1 General
The tactical navigation system consists of a digital computer which performs navigation calculations and visualizes the information of present and guided position.

These calculations are based on the following parameters provided by associated equipment
- Pitch and roll of the gyroscopic horizon
- Gyromagnetic compass magnetic heading
- Components of the ground speed vector delivered by a Doppler radar.
- Proper velocity of the compensated anemometer.

4.2 Navigation Indicator (Figure 10)
The navigation indicator has the function of:
- present the position of the goal in bearing and distance from a helicopter by receiving information from the navigation system.
The operator chooses the goal to which he wants to be guided from the 9 goals stored in the calculator.
- Indicate the route followed and the route to follow.

4.2.1 Description
The navigation indicator is mounted on the dashboard. His face front features:
- a rose that indicates the magnetic heading (4)
- A fine needle that gives a compass radio reading (3)
- A 3-reel counter that indicates the distance to the goal (1)
- a moving index indicates the drift and the course followed (2)
- A wide needle that indicates the magnetic bearing of the goal and the route to follow. (5)
- CAP? alarm flags (6)

Edited October 15, 2024 by Ramsay

[some1]

2 hours ago, Ramsay said:

AFAIK it's a index that (should) indicate drift and the route followed i.e. your ground track.

Thanks for the details. Yeah, it definitively doesn't show that right now.