I’ve tried out the following example from thbook adding this to my layout
 
 code tex-map
    \def\maplayout{ 
      \legendbox{0}{100}{NW}{\northarrow}
    }
  endcode

This works fine for \northarrow and \scalebar but when I tried it with \cavename or \comment I get the following error

(./th_formdef.tex) (./th_pagedef.tex
! Missing { inserted.
<to be read again> 
                   }
\legendbox ...\unskip \setbox \tmpboxa =\vbox {#4}
                                                  \sx =\wd \tmpboxa \sy =\ht...

\maplayout -> \legendbox {0}{100}{NW}{\comment }
                                                 
l.12 \setbox\xxx=\hbox to \x{\maplayout
                                       \hfill}%\dp\xxx=0bp
A left brace was mandatory here, so I've put one in.
You might want to delete and/or insert some corrections
so that I will find a matching right brace soon.
(If you're confused by all this, try typing `I}' now.)

) (./th_pages.tex)
 54 numeric registers used out of 32768

! Missing } inserted.
<inserted text> 
                }
<to be read again> 
                   \end 
l.653 \end
          
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.


Underfull \hbox (badness 10000) detected at line 653
[][][]   

\hbox(1167.36124+0.0)x1296.84499, glue set 257.37057
.\pdfliteral{q 1.00 1.00 1.00 rg -28.34993 -1191.34709 1348.6867 1219.68703 re 
f Q}
.\hbox(1167.36124+0.0)x0.0
..\pdfliteral{/OC /oc7 BDC}
..\pdfliteral{q 1 g}
..\hbox(1166.3575+0.0)x0.0, glue set - 1273.75873fil
...\kern 1.00374
...\hbox(1091.07625+0.0)x1272.75499, shifted -75.28125 []
...\glue 0.0 plus 1.0fil minus 1.0fil
..\pdfliteral{Q}
..\pdfliteral{EMC}
..etc.
.\hbox(0.0+0.0)x0.0
..\hbox(1167.36124+0.0)x0.0, glue set - 1296.84499fil
...\kern 0.0
...\hbox(1167.36124+0.0)x1296.84499 []
...\glue 0.0 plus 1.0fil minus 1.0fil
.\glue 3.33333 plus 1.66666 minus 1.11111
.\glue 3.33333 plus 1.66666 minus 1.11111
.etc.

Has anyone any idea what is wrong?


Dave Clucas
daveclucas.com
sarawak-caves.com
dave.clucas@icloud.com

Exploring the World - One cave at a time