Recommend a calculator?


I'm in need of a calculator for field use. I regularly take out a small submersible on a small boat. The coordinates I use for the submersible are easting/northing (zone 55). The coordinates the boat captain uses are lat/long with decimal minutes. I want to write a small program to convert to/from various dms formats and easting/northing, so that I can easily direct the captain where to take me. The formula is readily available, if rather convoluted. Should be a breeze for a handheld to calculate.

In any case, I'm wondering what calculator I should purchase for this? I don't particularly care about brand but HP would be fine. there seem to be a lot of downsides to HP50G and HP38GII.


A 34S perhaps?

Not that they are immediately relevant to you, but the library has ECEF coordinates to lat/long conversions.

- Pauli


There were commercially available programs to convert UTM (& Lambert) to local coordinates on the 41 and 48, so i know the 50 could do it. I haven't seen anything too wrong with the 50. Precision Survey Solutions uses it, so it must be at least passable, but they do protect it well in that battle case.
If you can program in RPL; the 48G usually goes for as cheap as $30 and your routine should fit easily in 32k. It would have the obvious advantage of outputting Northing, Easting, Depth, and four other things without R/S-ing. Input would be easily reviewable too. Since it sounds like you are using this near salt water; occasionally there are those TDS environmental cases for the 48 series on ebay. It's easy to fit a zip lock baggie for them too.

Addendum: Sorry Paul. How could i have forgotten the 34s? Plenty of room in 2k of RPN for his needs, and a Promptable/Labelable screen. The screen on my 20b based unit took a dump so i wasn't thinking of it.

In other news: I just got my dm15cc today and i must admit; i'm a victim of new love.

Edited: 14 Aug 2012, 12:06 a.m. after one or more responses were posted


Plenty of room in 2k of RPN for his needs, and a Promptable/Labelable screen.

Even better, the programs to do the conversions could be put into the almost 12kb of non-volatile user library flash. No need to worry about running out of battery & losing RAM then :-)

- Pauli


As long as you haven't fallen victim to jealousy :)


If you don't need a powerful solver, I think that you can do the whole programming more easily on a Casio fx-5800p. Around 28kB, it's the cheapest (TAS), and currently in production, has a clamshell cover, and needs just one AA battery (User's guide). Bad news is you need another one if you are willing to backup your programs. Good news is you won't regret losing it... and should withstand some abuse.


If we are talking Casio, I would recommend the FX 9860G SD in either of its generations. I have owned one for years and it has been a dependable workhorse. It has good connectivity, an SD card slot and an ultra-high contrast screen that none of me other programmable graphical calculators (mostly HP) can approach for readability in poor light (by middle-aged eyes).

With an SD card installed, it can do a full state backup to file archive in a couple of seconds, so you know your data is safe. There are slightly cheaper models without the SD card but it is worth the extra cost to have this convenient facility.

Edited: 15 Aug 2012, 1:12 p.m.


(I really couldn't justify buying one of those... but the backlit screens in the 9860GII and 9860G slim are too tempting.)

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