sighting

Etymology

noun

1. The act of catching sight of something, especially something searched for.
   There will be a small prize for the first sighting of a seal.
   However, many people—including railwaymen—are only beginning to realise how great is the amount of civil engineering work necessary to achieve adequate clearances for high-voltage overhead equipment under bridges and tunnels; what is involved in the re-signalling needed to permit the increased throughput of traffic (in some places it is unavoidable, to afford better sighting of signals obscured by overhead electrical gear); …. 1961 December, “Planning the London Midland main-line electrification”, in Trains Illustrated, page 719

verb

1. present participle and gerund of sight