偵察機
ていさつき reconnaissance plane spy plane

偵察衛星
ていさつえいせい reconnaissance satellite spy satellite

偵察要員
ていさつよういん player put on starting list to be replaced by another when the opponent's pitcher is known

偵察隊
ていさつたい scouting party patrol

偵察飛行
ていさつひこう surveillance flight