Aviation/Navigation Calculators

Aviation/Navigation Calculators

Navtronic 16 Navtronic 16. Developed by Specialized Electronics Corporation (SEC) in 1977, it was an aviation calculator that incorporates 16 LEDs to denote the function calculated/displayed. A BRT/DIM switch was dimming the display for nighttime flying. Original price: $230
Navtronic 1701 Navtronic 1701. Based on the earlier Navtronic 16, it incorporates the same 16 LEDs, but the LEDs are now protected on the keyboard panel. There were four versions manufactured each incorporating different features.
  Navtronic 1701t. Based on the Navtronic 1701, it incorporates count down/up timer with alarm, but no RNAV capabilities.
  Navtronic 1701r. Based on the Navtronic 1701, it incorporates RNAV capabilities, but no timer.
Navtronic 1701tr Navtronic 1701tr. Based on the Navtronic 1701, it incorporates RNAV capabilities and a count down/up timer with alarm.
Navigator Navtronic Navigator. Introduced on June 3, 1983, by Specialized Electronics along with the Explorer (below), it included basic navigation functions, such as: True Airspeed, Calibrated Airspeed, Density Altitude, Time to Climb, Distance to Climb and Rate of Climb calculation, Ground Speed calculation, Fuel requirement and Consumption Rate calculation, Weight and Balance calculations and Estimated Ground Speed and Heading calculation.
Explorer Navtronic Explorer. Introduced on June 3, 1983, by Specialized Electronics, this was an advanced version of the Navigator (above) adding Rhumb Line Calculations, Timer and Clock functions and RNAV calculations.
Explorer (Version 2) Navtronic Explorer (Version 2). This later edition was Introduced in 1987 and, although identical to the original 1983 Explorer model, it is not as solidly built. Also the original solid keys were replaced with rubber keys in this version.
Commodore N-60 Commodore N-60. Introduced in 1976 by Commodore (UK), the N-60, aka Navigator, has an impressive number of keys: 60! The provided functions are all the navigation functions expected to be found in such a calculator.
Heathkit OC-1401 Heathkit OC-1401 (OCW-1401). A powerful aviation calculator manufactured by Heathkit Company of Michigan, USA, in 1978. Heathkit offered several electronic devices and calculators as kits. This particular one was made available either as a kit (OC-1401), or assembled (OCW-1401).
Tamaya NC-2 Tamaya NC-2. Manufactured by Tamaya & Company, Ltd. in Japan, known for its navigation instruments, this is a Digital Navigation Computer. It was introduced in 1976 and was replaced by the NC-77 (see below).
Tamaya NC-77 Tamaya NC-77. Manufactured by Tamaya & Company, Ltd. in Japan, known for its navigation instruments, this is a Digital Navigation Computer. It was introduced in 1978 and was sold until 1991 (a record only beaten by HP with the 12C).
Tamaya NC-88 Tamaya NC-88. Another example of a Tamaya Digital Navigation Computer, released around 1983. This one has an LCD display and a built-in printer.
Tamaya NC-99 Tamaya NC-99. Released in 1994. This Tamaya was basically a Sharp OZ-7200 Electronic Organizer with the Tamaya Practical Navigator card and the Tamaya logo. The navigator card actually works on any Sharp Organizer. 
Tamaya NC-2000 Tamaya NC-2000. A more recent Tamaya Navigation computer and probably the most expensive one. Includes built-in almanac for all planets and 63 stars from 1583 to 2100. Discontinued in 2003.Original price: $1,200
Jeppesen Avstar Jeppesen Sanderson Avstar. Developed and manufactured by Texas Instruments with the Jeppesen Sanderson logo in 1980. It was based on the TI-58 design.
Jeppesen AvstarCessna Cessna Sky/Comp. This is practically the same calculator as the Jeppesen Sanderson Avstar (above), but with the Cessna logo.
Jeppesen Avstar Jeppesen Sanderson Avstar. Another version of the Jeppesen Avstar introduced in 1986, basically with an improved keyboard. This one was based on the TI-35-II and it was one of the best Jeppesen/Texas instruments models.
Jeppesen Prostar Jeppesen Sanderson Prostar. A later version of the Jeppesen Avstar introduced in 1982.It was again manufactured by Texas Instruments and based on the TI-55-II. Due to the keyboard's terrible design, Texas Instruments cancelled the TI-55-II (and the Prostar with it) and introduced the TI-55-III and a new Prostar in 1986.
Jeppesen Techstar Jeppesen Sanderson Techstar. This is the first Jeppesen calculator designed exclusively for Jeppesen. All previous calculators were redesigned Texas Instruments casings with reprogrammed for aviation calculations. It was introduced in 1992.
CX-1 CX-1 Pathfinder. Manufactured by ASA, this is a modern navigation calculator.
Sharp EL-512/Merlin Sharp EL-512/Merlin. This is a SHARP calculator with a programmable ROM with Navigation commands, manufactured by Merlin.

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Copyright A. Spyropoulos 2002