Page 54: of Maritime Reporter Magazine (December 1986)

Navigation &

Communications Equipment ••••^••••••••maBBHHHi (continued) approved and are designed to meet

IMO, USCG and other leading spec- ifications.

Over 500 of these radars have already been sold worldwide. U.S. customers include the New Jersey- based Sealand Company who are to install a series of 7600 X and S-band

RM and TM units on new container vessels destined for the Alaskan trade.

Principal features of these ad- vanced radars include a centered

TM display mode for maintenance of own ship position fixed on PPI while indicating targets with their true trails; adjustable lengths of tar- get trails may also be generated for rapid orientation to given traffic sit- uations.

A newly developed 12-inch vari- ant of the 7600-8600 series, the At- las 5600, is also available. Suitable for small ships of any size or class, it is designed to operate over nine ranges extending from 0.3 to 72nm.

Available with either X or S-band transceiver/slotted array antennae, the 5600 can be interswitched for cross-connection as well as master- slave operation.

The 7600-8600 radars also have been adapted for vessel traffic con- trol applications, allowing for trans- mission of radar data from remote sites to central control. For these uses, KAE has adopted narrow band compression techniques in which signals from the radar transceiver, such as antenna angle pulses, north reference pulse, radar trigger and video, are all reduced to a common signal and then shaped to conform with any standard industrial TV transmission format using coaxial cable, fiber optic systems, twin-wire connections or microwave links of differing frequencies.

The radars also form an integral part of KAE's advanced NACOS 20 modular navigation bridge control system designed for single manning and which is already beginning to attract considerable U.S. interest. A basic configuration comprises an 8600 ARPA and either a 7600 TM or

ARPA, an Atlas Dolog 23 doppler log, echo sounder and an adaptive radar-controlled autopilot, or AR-

CAP, for which the 8600 also pro- vides input and monitoring facili- ties. Also included is a full-color navigation information display (NID) console together with inter- faces for other sensors and bridge equipment.

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MAGNAVOX

Magnavox is offering the new MX 4400 GPS Positioning and Naviga- tion System, designed as a full-fea- tured two-channel C/A code receiv- er. The unit has been designed by

Magnavox for use with the current interim GPS constellation and with increasing utility as more satellites are employed.

The two-channel receiver pro- vides continuous GPS navigation, without interruption, whenever suf- ficient satellites are available. The

MX 4400 can navigate with as few as two visible satellites when an external atomic frequency standard is interfaced and altitude is known (sea level) or determined from the receiver's altimeter. This capability extends the number of hours per day that the MX 4400 receiver can be used. To provide navigation dur- ing GPS coverage gaps, the MX 4400 will automatically dead reckon using inputs from external speed and heading sensors.

Magnavox plans to introduce software in 1987 to permit the MX 4400 to accept GPS differential cor- rections in the standard RTCM SC- 104 format. The differential inputs will result in enhanced dynamic ac- curacy in real time.

In order to provide continuous, optimum navigation and position- ing information, the MX 4400 em- ploys an 8-state Kalman filter which evaluates and weighs satellite data.

A 16-bit numerical co-processor provides position, speed and head- ing updates every 1.2 seconds. The system has the capability of provid- ing GPS data to integrated survey systems such as the Magnavox Se- ries 5000 Geophysical Survey Sys- tem.

In addition, the Magnavox Ad- vanced Products & Systems Compa- ny recently announced the creation of a program for worldwide rentals of its navigation, communication and survey products. NAV-COM

Inc., a Magnavox subsidiary, will be the rental agent for the program.

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MICROLOGIC

Micrologic of Chatsworth, Calif., are the manufacturers of the simple- to-use ML-7500 navigation system, which, according to the firm, can be mastered by the average user in just a few hours.

This new Loran has 125 way- points that can be called by name or number, a 26-point "SAVE" func- tion, a backspace key for easy cor- rection of keyboard inputs, and a submersion-proof case. Standard automatic features include: chain and secondary selection; acquisition of master and up to five secondaries; magnetic variation; ASF (land mass) correction; waypoint sequenc- ing for 99 waypoints; route following for 99 route points; enveloper cali- bration; and computer memory test.

In addition, the ML-7500 has LL to TD and TD to LL conversion; a yacht racing countdown timer; way- point arrival, anchor watch, and cross track error alarms; six notch filters; range and bearing to 99 way- points; cross track error/time-to-go; speed over the bottom/course made good; elapsed distance; and two- point range and bearing.

Made portable with an optional rechargeable battery pack, the ML- 7500 can also be used on several ves- sels without permanent installation.

The battery pack powers the unit

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