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Watch Receiver:

A watch receiver is a receiver dedicated to guarding a distress frequency. A high seas watch receiver is usually quiet. It will un-squelch when a distress signal of the proper format is received. It will not respond to ordinary calls to establish communication. The frequency is 2.182MHz, the international distress and calling frequency. A marine V.H.F. watch receiver is dedicated to guarding channel 13 (156.650MHz) for safety (security) broadcasts. It is especially useful for vessels running coast wise or in harbors. Some channel 13 receivers include a transmitter so that a safety situation can be transmitted to other stations in the vicinity.

Intech Mariner 1511

Manufactured by: Intech

Model: Mariner 1511

Date of Mfg: 5-81

Capacity: 12 Channels Crystal

Check out more on Watch Receiving Regulations in the link down below: 

 http://www.navcen.uscg.gov/?pageName=mtWatch

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Radiotelephone:

Radiotelephones came into use in the 1920's and 1930's.  Radiotelephones are a means of voice communications with a shore or ship telephone via marine operator, directly with a dispatcher, agent or owner, or directly with other vessels. The first radiotelephones were amplitude modulated (AM).  These were subject to interference by atmospheric noise and man-made noise.  The operating frequencies range between 2 and 23 Megahertz; the operating range under favorable conditions is several thousand miles. In the 1950's a very high frequency (VHF) band of frequencies was set aside for marine use.  At first there were 26 channels.  Communication is essentially line-of-sight, making the useful range about 20 miles offshore from a shore station.  In the late 1960's the number of channels was doubled by making each channel half of the bandwidth (50 kilohertz per channel was changed to 25 kilohertz). The VHF marine channels are frequency modulated (FM), providing some immunity to noise. In the 1960's, Single Sideband (SSB) began to come into use.  SSB has an advantage of needing less than one-half the bandwidth that AM requires.  With the reduced bandwidth, interference by noise is somewhat reduced, and the number of available channels was more than doubled.  The use of SSB was encouraged.  In 1977 AM usage by law ceased; all high seas communications were mandated to be SSB.

VHF-Radio Telephone

Modar Electronics – D33ADA1020A

Manufactured by: Modar Electronics, Subsidiary of Motorola

Model: D33ADA1020A

Capacity: 55 Channels Synthesized, 25W/1W

Frequency Range: 156-157.45 MHz TX, 156-163 MHz RX

Power Requirement: 12VDC

  

Standard Comm. Corp. – Horizon MAXI

Manufactured by: Standard Comm. Corp.

Model: Horizon MAXI

Capacity: 55 Channels Synthesized, 25W/1W

Frequency Range: 156-157.45 MHz TX, 156-163 MHz RX

Intech – V-108

Manufactured by: Intech

Model: V-108

Date of Mfg: 1-78

Capacity: 12 Channels, Crystal, 25W/1W

Power Requirement: 12VDC 5 Amp

  

Cybernet – CTX7800S

Manufactured by: Cybernet

Model: CTX7800S

Capacity: 55 Channels, Synthesized, 25W/1W

  

Intech – Mariner 90

Manufactured by: Intech

Model: Mariner 90

Date of Mfg: 4-81

Capacity: 55 Channels, Synthesized, 25W/1W

Konigsberg Electronics – KR-25W

Manufactured by: Konigsberg Electronics (Konel)

Model: KR-25W

Capacity: 12 Channels, Crystalled, 25W/1W

Ray Jefferson – 7878M

Manufactured by: Ray Jefferson, Div of Jetronic Industries Inc.

Model: 7878M

Capacity: 55 Channels, Synthesized, 25W/1W

Single Sideband Receivers

Harris – RF-230M

Manufactured by: Harris

Model: RF-230M

Capacity: 95 Channels Synthesized

Frequency Range: 2-23MHz 

Hull – 922

Manufactured by: Hull

Model: 922

Capacity: 22 Channels Synthesized

Frequency Range: 2-10MHz

Northern Radio Company – N550A

Manufactured by: Northern Radio Company

Model: N550A

Capacity: 48 Channels Synthesized

Frequency Range: 2-23MHz

Intech – Mariner 500

Manufactured by: Intech

Model: Mariner 500

Date of Mfg: 9-83

Capacity: 12 Channels

Frequency Range: 2-3.4MHz

Power Requirement: 13.6VDC 20 Amp

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Satellite Navigator:

The Transit Satellite Navigation system was developed by the US Navy in 1964. It came into widespread use in the early 1970’s. The system consists of six or more satellites in nearly-polar orbits, transmitting data continuously. The receivers accept the data and from the characteristics of reception calculates own ship’s position, displayed as degrees and minutes of latitude and longitude. Future passes of satellites are also calculated even with own ship’s speed and course factored in. Coverage is worldwide, but not continuous, as a ship may be out of view of a satellite for an hour or more. The Loran C and Transit Satellite Navigation systems, while capable of accurate fixes (within a few hundred feet for transit satellite, less than 100 feet for Loran C), have largely been supplanted by GPS (Global Positioning System) With 24 satellites, coverage is worldwide and virtually continuous. Position is given in degrees and minutes of latitude and longitude. Accuracy is capable of being within a few feet. Satellite Navigation is a system that uses satellites to provide autonomous geo-spatial positioning. It allows small electronic receivers to determine their high precision using time signals transmitted along a line of sight by radio from satellites. The system can be used for navigation or for tracking the position of something fitted with a receiver. The signals also allow the electronic receiver to calculate the current local time to high precision, which allows time synchronization. Satellite navigation systems operate independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the positioning information generated.

Raytheon – RAYSAT-100

Manufactured by: Raytheon Marine Company

Model: RAYSAT-100

Operating Frequencies: 399.968 MHz

Magnavox – MX-5102

Manufactured by: Magnavox

Model: MX-5102

Power Requirement: 10-30 VDC 2 Amp

Operating Frequencies: 399.968 MHz

Japan Radio Company – JLE-3850

Manufactured by: Japan Radio Company

Model: JLE-3850

Power Requirement: 12-32 VDC 2 Amp

Operating Frequencies: 399.968 MHz

Navidyne – ESZ-4000

Manufactured by: Navidyne

Model: ESZ-4000

Date of Mfg: 6/80

Operating Frequencies: 399.968 MHz

Magnavox – MX-1102

Manufactured by: Magnavox

Model: MX-1102

Power Requirement: 115 VAC 50/60 Hz,150 Watts Max

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Sextant

A sextant is a measuring instrument generally used to measure the angle of elevation of a celestial object above the horizon. Making this measurement is known as sighting the object, shooting the object or taking a sight. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. A common use of the sextant is to sight the sun at noon to find one's latitude. Held horizontally, the sextant can be used to measure the angle between any two objects, such as between two lighthouses, which will, similarly, allow for calculation of a line of position on a chart.

The specific feature that let the sextant displace the astrolabe is that celestial objects are measured relative to the horizon, rather than relative to the instrument. This allows much better precision. Since the measurement is relative to the horizon, the measuring pointer is a beam of light that reaches to the horizon. The measurement is thus limited by the angular accuracy of the instrument and not the sine-error of the length of a viewing pointer, as it is in an astrolabe. The horizon and celestial object remain steady when viewed through a sextant, even when the user is on a moving ship. This occurs because the sextant views the (unmoving) horizon directly, and views the celestial object through two opposed mirrors that subtract the motion of the sextant from the reflection. The sextant is not dependent upon electricity (unlike many forms of modern navigation) or anything human-controlled (like GPS satellites). For these reasons, it is considered an eminently practical back-up navigation tool for ships.

David White Co.- Mark II

Manufactured by: David White Co.

Model: Mark II

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Bearing Circle:

The bearing circle is not a piece of electronic equipment. It includes an aperture, sight wire, and a mirror. The bearing circle is laid on the wing repeater and rotates easily. A buoy or landmark is sighted through the bearing circle and the bearing scale is seen in the mirror. Since the wing repeater is driven from the gyro compass, the bearing seen is the true bearing for the vessel. On a chart, the reciprocal (differing by 180 degrees) bearing from two or more of the buoys or land marks can be drawn; own vessel is at the intersection of the lines. “Bearing” is a term used in navigation to refer the direction or course of motion itself, the direction of a distant object relative to the current course (or the "change" in course that would be needed to get to that distant object), or the angle away from North of a distant point as observed at the current point. In Navigation, Absolute bearing refers to the angle between the magnetic North (magnetic bearing) or true North (true bearing) and an object. For example, an object to the East would have an absolute bearing of 90 degrees. Relative bearing refers to the angle between the craft's forward direction, and the location of another object. For example, an object relative bearing of 0 degrees would be dead ahead; an object relative bearing 180 degrees would be behind. Bearings can be measured in mils or degrees.

The Eastern Specialty Company – Mark 1 Model 2

Manufactured by: The Eastern Specialty Company

Model: Mark 1 Model 2

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Wind Direction and Speed Indicator:

As the title implies, these instruments display the wind speed and direction. The display may be on a meter face or it may be a digital readout. The wind speed and direction are relative to the ship. The ship’s speed and course must be taken into account to obtain the true wind speed and direction. Many ships, including foreign flag ships, cooperate with the U.S. Weather Bureau by sending weather data to the bureau in intervals while at sea. This data consists of barometric pressure, wind speed, and direction, temperature, clouds, and of course own position. Wind direction is reported by the direction from which it originates. For example, a northerly wind blows from the north to the south. Wind direction is usually reported in cardinal directions or in azimuth degrees. For example, a wind coming from the south is given as 180 degrees; one from the east is 90 degrees. An example of a Wind Speed Indicator is the anemometer. It is a device used for measuring wind speed, and is a common weather station instrument. The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed measurement instrument used in meteorology. The first known description of an anemometer was given by Leon Battista Alberti in 1450.

                                                                                                       

Wind Direction Indicator                  

Manufactured by: Thomas Walker & Son, Ltd

Wind Speed Indicator

Manufactured by: Thomas Walker & Son, Ltd

As shown on the left: A knot is a unit of speed. It is abbreviated kt or kn. It is a non-SI unit accepted for use with the SI. It is used around the world in meteorology and for maritime and aviation purposes.