HP 71B and HP 75C: Degrees and DMS Conversions

HP 71B and HP 75C:  Degrees and DMS Conversions

At default, the HP 71B and HP 75C do not have conversions between degrees and degrees-minutes-seconds.   Here are two short programs to remedy this and can be used as subroutines.  The language used is BASIC.

HP 71B and HP 75C Code:  DMS to Degrees.  File Name: DMS2D

10 INPUT "d, m, s? ": H, M, S

20 D=SGN(H)*(ABS(H)+M/60+S/3600)

30 PRINT D; "°"

HP 71B and HP 75C Code:   Degrees to DMS.   File Name:  D2DMS

10  INPUT "DEC DEG? "; D

20 G=SGN(D) @ D=ABS(D) @ H=IP(D)

30 M=IP(FP(D)*60)

40 S=FP(FP(D)*60)*60

50 PRINT G*H; "°"; M; "m"; S; "s"

Notes:  

1.  The degree character, °, can be typed by the following combinations:

HP 71B:  g, CTRL, A

HP 75C:  CTL + A

2.  When entering DMS, separate degrees, minutes, and seconds by commas.  For negative degrees in DMS format, enter the negative sign in front of degrees.  

3.  Repeating decimals (like 42.606666666...) may produce approximate conversions.  

Examples to Try

43.25° ←→ 43° 15m 0s 

-63.27°  ←→ -63° 16m 12s

42.60166667° ←→ 42° 36m 6s  (about)

Eddie

All original content copyright, © 2011-2023.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author. 

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Eddie

All original content copyright, © 2011-2018.  Edward Shore.   Unauthorized use and/or unauthorized distribution for commercial purposes without express and written permission from the author is strictly prohibited.  This blog entry may be distributed for noncommercial purposes, provided that full credit is given to the author.  Please contact the author if you have questions.