professional instruments are the choice of most seasoned and
serious seamen. These are not decorative toys. You
will find these on ships, tugboats and yachts that go out
beyond cell phone app range where dependable instruments are
most have items for predicting weather and water conditions.
You will find these instruments wherever you find serious
seamen, fishermen, yachtsmen, oil rig workers, all classes
of people who work or live on the water.