# Old navigational instruments

**URL:** <https://forum.gcaptain.com/t/old-navigational-instruments/72193>\
**Category:** Professional Mariner Forum\
**Created:** [March 22, 2025, 7:55pm UTC](https://forum.gcaptain.com/t/old-navigational-instruments/72193 "2025-03-22T19:55:18Z")\
**Posts on this page:** 1\
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**Author:** ![ombugge](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.gcaptain.com/ombugge/32/11217_2.png) [@ombugge](https://forum.gcaptain.com/u/ombugge)\
**Post date:** [March 22, 2025, 1:38pm UTC](https://forum.gcaptain.com/t/old-navigational-instruments/72193/2 "2025-03-22T13:38:47Z")

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> [@Stena Immaculate on fire off UK](https://forum.gcaptain.com/t/stena-immaculate-on-fire-off-uk/72072/255):
>
> starting with my 1st encounter with Texas Instruments scientific calculator in 1973 I believe

I started with one of these at Ålesund Maritime School, 1962-64:

 ![image](https://us1.discourse-cdn.com/flex016/uploads/gcaptain_maritime_forum/original/3X/4/3/431ed1f37015273bd9bde61eaaad8cd5d315eac2.jpeg)  
Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig)

We also had the more specialized kind for Navigation:

 ![image](https://us1.discourse-cdn.com/flex016/uploads/gcaptain_maritime_forum/original/3X/5/3/53579ff7b573bc2043236a2bb09f3cb9dd994c69.jpeg)

The high sophistication of Texas Instruments scientific calculators I has introduced to at the same venue when returning for Master class in 1968-69

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