Mountainman,
Having just been lifting loads around Shetland this past week I'd say glare from that low autumn/winter sun can be a right pain.
Adam Nams,
Why not take a crewman? You concentrate on flying the aircraft and we'll tell you where to go!
...some operations can't afford to lose 100kgs of payload on every trip! However, we still manage some reasonably-accurate load placing even when the mirror is on the wrong bl**dy side of the aircraft:
...were all done with HLO marshalling, mirror and occasional radio use. Not decrying crewmen by any means - on Chinooks I found that the pilot is merely a means of getting the crewmen to where they need to work next - but they aren't always the best way.