On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or ice. The open sea's telltale sign is thus a darkness on the underside of the clouds.


Finding Your Way Without Map Or Compass (ed. Courier Corporation, 1998) - ISBN: 9780486406138


On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or...

On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or...

On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or...

On land off an ice covered sea the traveler can, for example, detect the presence of open water, simply because it reflects less light than land or...