diff --git a/patchPD0 b/patchPD0
--- a/patchPD0
+++ b/patchPD0
@@ -2,9 +2,9 @@
 #======================================================================
 #                    P A T C H P D 0 
 #                    doc: Tue Aug 23 20:00:15 2016
-#                    dlm: Wed Jun 13 20:35:05 2018
+#                    dlm: Mon Jul  1 16:56:51 2019
 #                    (c) 2010 A.M. Thurnherr
-#                    uE-Info: 184 88 NIL 0 0 72 2 2 4 NIL ofnI
+#                    uE-Info: 189 0 NIL 0 0 72 2 2 4 NIL ofnI
 #======================================================================
 
 $antsSummary = 'patch TRDI PD0 file with external attitude data';
@@ -19,6 +19,7 @@
 #				  - BUG: not backward compatible with old IMP files any more
 #	Jun 13, 2017: - added pitch and roll to -o
 #				  - BUG: ??? does -o handle pitch and roll ANOMALIES correctly?
+#	Jun 30, 2019: - -o did not work with single argument
 
 # PATCH-FILE REQUIREMENTS (ANTS format)
 #	- %LADCP_pitch.mu %LADCP_roll.mu		mean LADCP pitch and roll
@@ -85,8 +86,6 @@
 # Step 2: Process External Attidue Input to Patch PD0 file
 #----------------------------------------------------------------------
 
-my($pr_missing,$hdg_missing) = (0,0);
-
 &antsIn();																	# load first IMP record
 
 my($ensF) 	= &fnr('LADCP_ens');
@@ -102,9 +101,9 @@
 if (defined($opt_o)) {
 	my($pofs,$rofs,$hofs) = split(/,/,$opt_o);
 
-	if (defined($pofs)) {													# pitch and roll offsets supplied
+	if (defined($rofs)) {													# pitch and roll offsets supplied
 		croak("$0: cannot decode -o $opt_o\n")
-			unless numbersp($pofs,$rofs);
+			unless numbersp($pofs,$rofs,$hofs);
 	} else {																# no pitch and roll, only heading
 		$hofs = $pofs; 
 		$pofs = undef;
@@ -128,13 +127,19 @@
 	}
 }
 
+my($pr_missing,$hdg_missing) = (0,0);
+my($missing_pr_block_len,$missing_hdg_block_len);
+
 do {
+	my($ADCP_deployed);
 	my($ens) = $P{RECNO};
 	die("assertion failed [$ants_[0][$ensF] != $LADCP{ENSEMBLE}[$ens]->{NUMBER} --- 1-$LADCP{ENSEMBLE}[0]->{NUMBER} + $P{RECNO} + $d]")
 		unless ($ants_[0][$ensF] == $LADCP{ENSEMBLE}[$ens]->{NUMBER});
 	$LADCP{ENSEMBLE}[$ens]->{DATA_SOURCE_ID} = 0xA0;
 	
 	if (numbersp($ants_[0][$pitchF],$ants_[0][$rollF])) {					# valid IMP data -> patch LADCP ensemble
+		$ADCP_deployed = 1;
+		$missing_pr_block_len = 0;
 		if (defined($opt_o)) {												# -o set: rotate pitch and roll into correct coordinates
 			my($rot_p) = ($ants_[$r][$pitchF]  * $crho +
 						  $ants_[$r][$rollF]   * $srho);
@@ -153,7 +158,8 @@
 			$LADCP{ENSEMBLE}[$ens]->{ROLL} = $LADCP_roll_mean + $ants_[0][$rollF];
 		}
     } else {																# no valid IMP pitch and roll => invalidate LADCP data
-    	$pr_missing++;
+    	$pr_missing++ if $ADCP_deployed;									# don't count missing before deployment
+    	$missing_pr_block_len++;
 		unless ($opt_k)  {
 	    	clearEns(\%LADCP,$ens);
 	    	$LADCP{ENSEMBLE}[$ens]->{DATA_SOURCE_ID}= 0xA0;
@@ -162,6 +168,7 @@
 	    
     if (numberp($ants_[0][$hdgF])) {										# valid IMP heading
     	$LADCP{ENSEMBLE}[$ens]->{DATA_SOURCE_ID} |= $opt_h;
+		$missing_hdg_block_len = 0;
    		if (defined($opt_o)) {												# apply offset on -o; otherwise, data are correctly rotated
 	    	$ants_[0][$hdgF] -= $rho;
 	    	$ants_[0][$hdgF] += 360 if ($ants_[0][$hdgF] < 0);
@@ -169,13 +176,16 @@
 		$LADCP{ENSEMBLE}[$ens]->{HEADING} = $ants_[0][$hdgF]				# patch heading
 			if $opt_h;
 	} else {																# no valid IMP heading => invalidate LADCP data
-		$hdg_missing++;
+		$hdg_missing++ if $ADCP_deployed;
+		$missing_hdg_block_len++;
 		unless ($opt_k)  {
 	    	clearEns(\%LADCP,$ens);
 	    	$LADCP{ENSEMBLE}[$ens]->{DATA_SOURCE_ID}= 0xA0;
 	    }
 	}
 } while (&antsIn());
+$pr_missing  -= missing_pr_block_len;										# don't count final block (post recovery)
+$hdg_missing -= missing_hdg_block_len;
 
 $LADCP{ENSEMBLE}[0]->{DATA_SOURCE_ID} = 0x7F;								# ensure correct DSID (1st ens: orig; 2nd ens: this prog)
 $LADCP{ENSEMBLE}[1]->{DATA_SOURCE_ID} = 0xA0