In channel waters, look-outs must not be confined to the round of the sea. To the U-boat's gunfire and torpedo, to the menace of moored and drifting mines, is added a danger that rarely threatens the oversea trader--an attack from the air. Striking distance from enemy bases has given opportunity for exercise of aircraft. Zeppelin and seaplane have their turns of activity in the North Sea and the Straits. Steering a careful course in a sea 'foul with floating mines,' the Cork steamship _Avocet_ was attacked by three aeroplanes. The action lasted for over half an hour. Bombs exploded alongside, the bridge and upper decks were scarred and pitted by a hail of machine-gun bullets. The master and mate kept the aircraft at a respectful height by using their rifles--the only arms carried. By skilful handling, Captain Brennell saved his ship. He is probably the only seaman who has steered a deliberate course between a 'fall' of bombs; swinging on starboard helm, 'three bombs missed the starboard bow and three the port quarter by at most seven feet.' The _Birchgrove_ was attacked by two seaplanes carrying torpedoes--a novel adaptation. Again the use of ready helm proved a moving ship a difficult target. Both torpedoes missed. Less fortunate was the _Franz Fischer_, an ex-German collier. Anchored off the Kentish Knock, the night black dark, the thunder of a Zeppelin's engines was heard overhead. Before there was time to extinguish all lights, the huge airship was able to take up a position for attack. One heavy bomb sufficed. _Franz Fischer_ reeled to a tremendous explosion, heeled over, and sank. Only three survived of her crew of sixteen. Constant sea-perils are enhanced by war measures in the channels. On open sea there is less confusion; the issue is narrowed to contest between ship and submarine and the hazard of a derelict or floating mine--there is ample sea-room in which to 'back and fill.' The coaster has a harder task. His navigational problem is complicated by the eight hundred odd pages of 'Notices to Mariners'--the amends and addends and cancellations of Admiralty instructions relating to the seafaring of the coast. Inner channels are confused by 'friendly' minefields or by alteration of the buoyage; aids to navigation are suspended or rearranged on scant notice; coastwise lights are put out or have their powers reduced to small efficiency in the mists and grey weather. Unmarked wrecks, growing daily in numbers, litter the sea-bottom; areas are to be avoided to leave a fair field for the hunters; zigzag courses in close proximity to the land sustain a constant anxiety. Above all, navigation without lights increases the danger to all merchantmen and to the patrols and naval craft that crowd the seaways of the coast.