diff --git a/modules/gmt/modgmt_func.cpp b/modules/gmt/modgmt_func.cpp
index 9d56d2e..6762576 100644
--- a/modules/gmt/modgmt_func.cpp
+++ b/modules/gmt/modgmt_func.cpp
@@ -129,7 +129,6 @@ const ObjectBase* GMT_LayerShift(const ObjectList* input)
  return new ObjectError("LayerShift",err);
 }
 
-
 // Draw frame with tics
 /*
 Input: pairs list.
@@ -147,169 +146,146 @@ framepen - pen for drawing frame. Default is 0.35,black.
 ticklen - lenght of tick-marks in cm. Default is 0.18.
 tickpen - pen for drawing ticks. Default is 0.3,black.
 trans or transparency - transparency level, double from 0 to 100. Default is 0 (opaque).
-transpmodel - transparency model, string. Choose from Color, ColorBurn, ColorDodge, Darken, Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal, Overlay, Saturation, SoftLight, and Screen. Default is Normal.
-x, xr or xrel - shift layer on x cm in horisontal direction. Default is 0.
-y, yr or yrel - shift layer on y cm in vertical direction. Default is 0.
+model - transparency model, string. Choose from Color, ColorBurn, ColorDodge, Darken, Difference, Exclusion, HardLight, Hue, Lighten, Luminosity, Multiply, Normal, Overlay, Saturation, SoftLight, and Screen. Default is Normal.
+rx or relx - shift layer on x cm in horisontal direction. Default is 0.
+ry or rely - shift layer on y cm in vertical direction. Default is 0.
 */
+template<class O>
+using SConvertor=Convert2Struct<std::string, O>;
+template<class O>
+using DConvertor=Convert2Struct<double, O>;
+
 const ObjectBase* GMT_DrawFrame(const ObjectList* input)
 {
- std::string opts="-P -O -K ";
- bool suc=true;
- struct gmt_layer layer;
- // Defaults
- std::string defxtics="down", defytics="left", defint="auto", defdomain="pos", deftranspmodel="Normal";
- bool defmark=false;
- gmt_font deffont; deffont.Convert("12,Times-Roman,black");
- double defoffset=0.18, defframewidth=0.1, defticklen=0.18;
- gmt_pen defframepen, deftickpen; defframepen.Convert("0.35,black"); deftickpen.Convert("0.3,black");
-
- { // Get projection
-  BaseMT2Projection proj(input,"proj","projection");
-
-  layer.proj=proj(&suc);
-  if(!suc) goto fail;
-  opts+=layer.proj.Value()+" ";
- }
-
- { // Get xint and yint
-  BaseMD2String xint(input,defint,"xint"), yint(input,defint,"yint");
-  double dx,dy;
-  std::string str;
+ struct XYIntVal // Representing intervals for tics intervals
+ {
+  bool isauto; double val;
+  XYIntVal():isauto(true),val(0.0) {} // Default is auto
+ };
 
-  str=xint(&suc);
-  if(suc && "auto"==str) dx=AutoStep(layer.proj.region.xb,layer.proj.region.xe);
-  else // No auto, get numeric value
-  {
-   Base2Double xint(input,"xint");
-   suc=true;
-   dx=xint(&suc);
-   if(!suc) goto fail; // Parameter exists, but conversion failed
-  }
+ class Base2TInt // Custom convertor class for xy tics intervals
+ {
+  public:
+  using ValueType=struct XYIntVal;
 
-  str=yint(&suc);
-  if(suc && "auto"==str) dy=AutoStep(layer.proj.region.yb,layer.proj.region.ye);
-  else // No auto, get numeric value
+  ValueType Convert(const ObjectBase* ob, bool* res, std::string& err)
   {
-   Base2Double yint(input,"yint");
-   suc=true;
-   dy=yint(&suc);
-   if(!suc) goto fail; // Parameter exists, but conversion failed
+   ValueType ret;
+   ret.isauto=false;
+
+   OBTypeM<SConvertor,ObjectString> sp(ob);
+   OBTypeM<DConvertor,ObjectReal,ObjectInt,ObjectString> dp(ob);
+   // Check string "auto"
+   if(sp.Error()==OBTypeErr::OK)
+   {
+    std::string s=sp(res,std::ref(err));
+    if(!res) {err="Unknown error"; goto fail;} // Impossible case
+    tolower(s);
+    if("auto"==s) {ret.isauto=true; return ret;}
+   }
+   // Check double value
+   switch(dp.Error())
+   {
+    case(OBTypeErr::OK):
+    {
+     ret.val=dp(res,std::ref(err));
+     if(ret.val<=0.0) {err="Tics interval must be greater the zero"; break;}
+     return ret;
+    };
+    case(OBTypeErr::NULLPTR): {err="Can't convert zero ObjectBase pointer to something meaningfull"; break;}
+    case(OBTypeErr::TYPEMISMATCH): {err="Can't convert "+ob->Type()+" to double: type mismatch"; break;}
+   }
+   fail:
+   *res=false;
+   return ret;
   }
-  opts+="-Bx"+ToString(dx)+" -By"+ToString(dy)+" ";
- }
-
- { // Get xtics and ytics
-  BaseMD2String x(input,defxtics,"xtics"), y(input,defytics,"ytics");
-  std::string xtics,ytics;
-  std::string xaxis,yaxis;
+ };
 
-  xtics=x(&suc);
-  if(!suc) goto fail; // Conversion failed
-  if("none"==xtics) xaxis="sn";
-  if("down"==xtics) xaxis="Sn";
-  if("up"==xtics) xaxis="sN";
-  if("both"==xtics) xaxis="SN";
+ std::string err,fakerr;
+ std::string opts="-P -O -K ";
 
-  ytics=y(&suc);
-  if(!suc) goto fail; // Conversion failed
-  if("none"==ytics) yaxis="we";
-  if("left"==ytics) yaxis="We";
-  if("right"==ytics) yaxis="wE";
-  if("both"==ytics) yaxis="WE";
+ struct gmt_layer layer;
 
-  if(xaxis.empty() || yaxis.empty()) goto fail; // Unknown value of xtics and/or ytics
+ struct gmt_font deffont;
+ struct gmt_pen defframepen,deftickpen;
+ deffont.Convert("12,Times-Roman,black",fakerr);
+ defframepen.Convert("0.35,black",fakerr);
+ deftickpen.Convert("0.3,black",fakerr);
+
+ RNFPar<Base2Proj,ObjectGMTProjection> proj("projection");
+ ONPar<Base2TInt> xint("x[ ]interval"), yint("y[ ]interval");
+ ONPar<Base2StringD> xtics("x[ ]tics[ ]position","down"), ytics("y[ ]t[ics[ ]position","left");
+ ONPar<Base2StringD> domain("domain","pos");
+ ONPar<Base2BoolD> mark("mark",false);
+ ONPar<Base2FontD> font("font",deffont);
+ ONPar<Base2DoubleD> offset("offset",0.18);
+ ONPar<Base2NonNegD> framewidth("f[rame][ ]width",0.1);
+ ONPar<Base2PenD> framepen("f[rame][ ]pen",defframepen), tickpen("t[icks][ ]pen",deftickpen);
+ ONPar<Base2DoubleD> ticklen("t[icks][ ]length",0.18);
+ ONPar<Base2TransD> transp("transparency",0.0);
+ ONPar<Base2StringD> transpmodel("model","Normal");
+ ONPar<Base2DoubleD> rx("r[el]x",0.0),ry("r[el]y",0.0);
+
+ ParseNamedParameters params(input,proj,xint,yint,xtics,ytics,domain,mark,font,offset,framewidth,framepen,tickpen,ticklen,transp,transpmodel,rx,ry); if(!params) {err=params.Error(); goto fail;} // Error parsing parameters
+
+ layer.proj=proj; // Get projection
+ opts+=layer.proj.Value()+" ";
+
+ { // Get tics intervals
+  XYIntVal dx=xint,dy=yint;
+  opts+="-Bx"+ToString(dx.isauto?AutoStep(layer.proj.region.xb,layer.proj.region.xe):dx.val)+" -By"+ToString(dy.isauto?AutoStep(layer.proj.region.yb,layer.proj.region.ye):dy.val)+" ";
+ }
 
+ { // Get xtics and ytics positions
+  std::string xt=xtics, yt=ytics;
+  std::string xaxis, yaxis;
+  TemplateComparator none("none"), both("both");
+  TemplateComparator up("up"), down("down");
+  TemplateComparator left("left"), right("right");
+  tolower(xt); tolower(yt);
+
+  if(none.Compare(xt)) xaxis="sn";
+  if(down.Compare(xt)) xaxis="Sn";
+  if(  up.Compare(xt)) xaxis="sN";
+  if(both.Compare(xt)) xaxis="SN";
+
+  if( none.Compare(yt)) yaxis="we";
+  if( left.Compare(yt)) yaxis="We";
+  if(right.Compare(yt)) yaxis="wE";
+  if( both.Compare(yt)) yaxis="WE";
+
+  if(xaxis.empty()) {err="Incorrect xtics position "+xtics.Value(); goto fail;} // Unknown value of xtics
+  if(yaxis.empty()) {err="Incorrect xtics position "+ytics.Value(); goto fail;} // Unknown value of ytics
   opts+="-B"+xaxis+yaxis+" ";
  }
 
  { // Get domain and mark
-  BaseMD2String d(input,defdomain,"domain");
-  BaseMD2Bool m(input,defmark,"mark");
+  std::string dom=domain;
   std::string format;
+  TemplateComparator p("positive"),n("negative"),c("centered");
+  tolower(dom);
 
-  std::string domain=d(&suc);
-  if(!suc) goto fail; // Conversion failed
-  if("pos"==domain) format="+ddd:mm:ss";
-  if("neg"==domain) format="-ddd:mm:ss";
-  if("center"==domain) format="ddd:mm:ss";
-  if(format.empty()) goto fail; // Unknown domain
-
-  if(m(&suc)) format+="F";
-  if(!suc) goto fail; // Conversion failed
+  if(p.Compare(dom)) format="+ddd:mm:ss";
+  if(n.Compare(dom)) format="-ddd:mm:ss";
+  if(c.Compare(dom)) format="ddd:mm:ss";
+  if(format.empty()) {err="Incorrect domain value "+domain.Value(); goto fail;} // Unknown domain
 
+  if(mark) format+="F";
   opts+="--FORMAT_GEO_MAP="+format+" ";
  }
 
- { // Get font
-  BaseMD2Font f(input,deffont,"font");
-  gmt_font font;
-  font=f(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--FONT_ANNOT_PRIMARY="+font.Value()+" ";
- }
-
- { // Get offset
-  BaseMD2Double o(input,defoffset,"offset");
-  double offset;
-  offset=o(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--MAP_ANNOT_OFFSET_PRIMARY="+ToString(offset)+"c ";
- }
-
- { // Get framewidth
-  SearchParameterWDef<double,false,PMin<0> > f(input,defframewidth,"framewidth");
-  double framewidth;
-  framewidth=f(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--MAP_FRAME_WIDTH="+ToString(framewidth)+"c ";
- }
-
- { // Get framepen
-  BaseMD2Pen p(input,defframepen,"framepen");
-  gmt_pen framepen;
-  framepen=p(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--MAP_FRAME_PEN="+framepen.Value()+" ";
- }
-
- { // Get ticklen
-  BaseMD2Double t(input,defticklen,"ticklen","ticklength");
-  double ticklen;
-  ticklen=t(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--MAP_TICK_LENGTH_PRIMARY="+ToString(ticklen)+"c ";
- }
-
- { // Get tickpen
-  BaseMD2Pen t(input,deftickpen,"tickpen");
-  gmt_pen tickpen;
-  tickpen=t(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--MAP_TICK_PEN_PRIMARY="+tickpen.Value()+" ";
- }
-
- { // Get transparency
-  Base2Transp t(input,"trans","transp","transparency");
-  double transp;
-  transp=t(&suc);
-  if(!suc) goto fail; // Conversion failed
-  if(transp!=0) opts+="-t"+ToString(transp)+" ";
- }
-
- { // Get transpmodel
-  BaseMD2String tm(input,deftranspmodel,"transpmodel","transparencymodel");
-  std::string transpmodel;
-  transpmodel=tm(&suc);
-  if(!suc) goto fail; // Conversion failed
-  opts+="--PS_TRANSPARENCY="+transpmodel+" ";
- }
+ opts+="--FONT_ANNOT_PRIMARY="+font.Value().Value()+" "; // Get font
+ opts+="--MAP_ANNOT_OFFSET_PRIMARY="+ToString(offset.Value())+"c "; // Get offset
+ opts+="--MAP_FRAME_WIDTH="+ToString(framewidth.Value())+"c "; // Get framewidth
+ opts+="--MAP_FRAME_PEN="+framepen.Value().Value()+" "; // Get framepen
+ opts+="--MAP_TICK_LENGTH_PRIMARY="+ToString(ticklen.Value())+"c "; // Get ticklen
+ opts+="--MAP_TICK_PEN_PRIMARY="+tickpen.Value().Value()+" "; // Get tickpen
+ if(transp!=0) opts+="-t"+ToString(transp.Value())+" "; // Get transparency
+ opts+="--PS_TRANSPARENCY="+transpmodel.Value()+" "; // Get transparency model
 
- { // Get x, y
-  BaseMD2Double x(input,0.0,"x","xr","xrel"), y(input,0.0,"y","yr","yrel");
-  layer.shiftx=x(&suc);
-  layer.shifty=y(&suc);
-  if(!suc) goto fail; // Conversion failed
- }
+ // Get shift
+ layer.shiftx=rx;
+ layer.shifty=ry;
 
  { // Calling psbasemap
   void* gmtapi;
@@ -328,5 +304,5 @@ const ObjectBase* GMT_DrawFrame(const ObjectList* input)
  return new ObjectGMTLayer(layer);
 
  fail:
- return 0;
+ return new ObjectError("DrawFrame",err);
 }
diff --git a/modules/gmt/modgmt_func.h b/modules/gmt/modgmt_func.h
index fe5a386..c101117 100644
--- a/modules/gmt/modgmt_func.h
+++ b/modules/gmt/modgmt_func.h
@@ -168,6 +168,7 @@ template<class Struct>
 using Base2StructD=DefaultConverter<typename TypeStorage<Struct>::Converter>;
 
 // Simple aliases of convertors
+using Base2Bool  =Base2Struct<bool>;
 using Base2Double=Base2Struct<double>;
 using Base2String=Base2Struct<std::string>;
 using Base2Coord =Base2Struct<struct gmt_coord>;
@@ -182,6 +183,9 @@ using Base2Layer =Base2Struct<struct gmt_layer>;
 // Simple aliases of convertors with default values
 using Base2StringD=Base2StructD<std::string>;
 using Base2DoubleD=Base2StructD<double>;
+using Base2BoolD  =Base2StructD<bool>;
+using Base2PenD   =Base2StructD<struct gmt_pen>;
+using Base2FontD  =Base2StructD<struct gmt_font>;
 
 // Specialised convertors
 // Convertor with default value for gmt_coord. Added constructor for creating default value from double argument