Instruct: Classify a given Amazon review as either positive or negative.
Query: Understanding Weatherfax

Very helpful for anyone who considers themselves a world traveller on the waters. When all alone out at sea the weather is the single most important information to ponder. The weatherfax is the most reliable source for this information and understanding how to read these weatherfaxes is a must. Very well written by an expert in the field of meterology and yachting. It resides in my pilothouse.