crystall-punk-14/Content.Client/Markers/MarkerComponent.cs

using Robust.Client.GameObjects;
using Robust.Shared.GameObjects;
using Robust.Shared.IoC;

namespace Content.Client.Markers
{
    [RegisterComponent]
    public sealed class MarkerComponent : Component
    {
        protected override void Startup()
        {
            base.Startup();

            UpdateVisibility();
        }

        public void UpdateVisibility()
        {
            var system = EntitySystem.Get<MarkerSystem>();

            if (IoCManager.Resolve<IEntityManager>().TryGetComponent(Owner, out ISpriteComponent? sprite))
            {
                sprite.Visible = system.MarkersVisible;
            }
        }
    }
}