I assume a .gsi file is some type of text file that you can read and make some sense of. If so, you could convert the data into a format (say with a text editor, Excel, etc.) that would be useable in a script file (.scr extension) to issue series of commands into AutoCAD. I've done this with lisp but LT version doesn't support AutoLisp. You could have a block, say called "surv_pt" that has attributes for point number, elevation, description. Also say you want block scaled by 20. Starting at point 100, script file would then look something like:
Multiple
-Insert
Surv_pt
x1 y1 z1 20 20 0 (responses to block insert prompts)
100 (these 3 are responses for attibute prompts)
123.67
BC Mon
x2 y2 z2 20 20 0
etc......
As I type this I see it would be quite a pain to create this file. Now say you just want to put a point in the drawing. Much easier script file to create:
Multiple
Point
x1 y1 z1
x2 y2 z2
etc.....
If this looks of any use to you and you have questions, let me know.
Good luck!