4 files changed, 57 insertions, 3 deletions
diff --git a/ds9/library/ds9.tcl b/ds9/library/ds9.tcl
index a7794bb..276fb0d 100644
--- a/ds9/library/ds9.tcl
+++ b/ds9/library/ds9.tcl
@@ -133,9 +133,6 @@ proc DS9Def {} {
 	win32 {set pds9(xpa) 0}
     }
     
-    set pds9(bg) white
-    set pds9(nan) white
-
     set pds9(prec,linear) 8
     set pds9(prec,deg) 10
     set pds9(prec,hms) 4
@@ -143,6 +140,9 @@ proc DS9Def {} {
     set pds9(prec,arcmin) 5
     set pds9(prec,arcsec) 3
 
+    set pds9(bg) white
+    set pds9(nan) white
+
     set pds9(samp) 1
     set pds9(confirm) 1
     set pds9(iraf) 1
diff --git a/ds9/library/frame.tcl b/ds9/library/frame.tcl
index 3da0029..7a9024e 100644
--- a/ds9/library/frame.tcl
+++ b/ds9/library/frame.tcl
@@ -142,6 +142,7 @@ proc CreateNameNumberFrame {which type} {
     
     $ds9(next) bg color $pds9(bg)
     $ds9(next) nan color $pds9(nan)
+
     $ds9(next) iraf align $pds9(iraf)
 
     $ds9(next) marker epsilon $pmarker(epsilon)
diff --git a/ds9/library/prefsdialog.tcl b/ds9/library/prefsdialog.tcl
index cdc02e7..fa36c64 100644
--- a/ds9/library/prefsdialog.tcl
+++ b/ds9/library/prefsdialog.tcl
@@ -53,6 +53,7 @@ proc PrefsDialog {{which {}}} {
     set dprefs(tabs) {}
 
     PrefsDialogGeneral
+    PrefsDialogPrecision
     PrefsDialogStartup
     PrefsDialogMenu
     PrefsDialogPanner
@@ -295,6 +296,54 @@ proc PrefsDialogGeneral {} {
 	-side top -fill both -expand true
 }
 
+proc PrefsDialogPrecision {} {
+    global dprefs
+    global ds9
+    global pds9
+
+    set w $dprefs(tab)
+
+    $dprefs(list) insert end [msgcat::mc {Precision}]
+    lappend dprefs(tabs) [ttk::frame $w.precision]
+
+    # Coordinates
+    set f [ttk::labelframe $w.precision.coord -text [msgcat::mc {Coordinates}]]
+
+    ttk::label $f.tlinear -text [msgcat::mc {Linear}]
+    ttk::entry $f.linear -textvariable pds9(prec,linear) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+    ttk::label $f.tdeg -text [msgcat::mc {Degrees}]
+    ttk::entry $f.deg -textvariable pds9(prec,deg) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+    ttk::label $f.thms -text [msgcat::mc {HMS}]
+    ttk::entry $f.hms -textvariable pds9(prec,hms) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+    ttk::label $f.tdms -text [msgcat::mc {DMS}]
+    ttk::entry $f.dms -textvariable pds9(prec,dms) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+
+    grid $f.tlinear $f.linear -padx 2 -pady 2 -sticky w
+    grid $f.tdeg $f.deg -padx 2 -pady 2 -sticky w
+    grid $f.thms $f.hms -padx 2 -pady 2 -sticky w
+    grid $f.tdms $f.dms -padx 2 -pady 2 -sticky w
+
+    # Length
+    set f [ttk::labelframe $w.precision.length -text [msgcat::mc {Length}]]
+
+    ttk::label $f.tarcmin -text [msgcat::mc {ArcMin}]
+    ttk::entry $f.arcmin -textvariable pds9(prec,arcmin) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+    ttk::label $f.tarcsec -text [msgcat::mc {ArcSec}]
+    ttk::entry $f.arcsec -textvariable pds9(prec,arcsec) \
+	-validate focusout -validatecommand PrefsPrecision -width 8
+
+    grid $f.tarcmin $f.arcmin -padx 2 -pady 2 -sticky w
+    grid $f.tarcsec $f.arcsec -padx 2 -pady 2 -sticky w
+
+    pack $w.precision.coord $w.precision.length \
+	-side top -fill both -expand true
+}
+
 proc PrefsDialogStartup {} {
     global dprefs
 
diff --git a/ds9/library/util.tcl b/ds9/library/util.tcl
index a647097..c4e8a2a 100644
--- a/ds9/library/util.tcl
+++ b/ds9/library/util.tcl
@@ -865,6 +865,8 @@ proc PrefsPrecision {} {
 	    $pds9(prec,deg) $pds9(prec,hms) $pds9(prec,dms) \
 	    $pds9(prec,arcmin) $pds9(prec,arcsec)
     }
+    # prefs validation command
+    return true
 }
 
 proc ChangeThreads {} {
@@ -873,6 +875,8 @@ proc ChangeThreads {} {
     foreach ff $ds9(frames) {
 	$ff threads $ds9(threads)
     }
+    # prefs validation command
+    return true
 }
 
 proc PrefsIRAFAlign {} {