+defined $routeparams->{MaxMass} or defined $routeparams->{MaxVolume} or return;
+
+#---------- compute the results ----------
+
+my @rsargs;
+
+foreach my $k (qw(MaxMass MaxVolume MaxCapital)) {
+ my $v= $routeparams->{$k};
+ push @rsargs, (defined $v ? $v : -1);
+}
+push @rsargs, defined $routeparams->{LossPerLeaguePct}
+ ? $routeparams->{LossPerLeaguePct}*0.01 : 1e-9;
+push @rsargs, qw(search 10 10), $maxdist, 'any', @islandids;
+
+m/[^-.0-9a-zA-Z]/ and die "$_ $& ?" foreach @rsargs;
+
+unshift @rsargs, dbw_filename($qa->{'Ocean'});
+unshift @rsargs, qw(-DN);
+
+if ($qa->{'debug'}) {
+</%perl>
+[[ <% "@rsargs" |h %> ]]<br><pre>
+<%perl>
+}
+
+unshift @rsargs, sourcebasedir().'/yarrg/routesearch';
+
+my $fh= new IO::File;
+my $child= $fh->open("-|"); defined $child or die $!;
+if (!$child) {
+ my $cpu= BSD::Resource::RLIMIT_CPU;
+ my ($soft,$hard)= getrlimit($cpu);
+ my $max=10;
+ setrlimit($cpu,$max,$hard) or die $! if $soft>$max;
+ exec @rsargs;
+ die $!;
+}
+
+while (<$fh>) {
+ chomp;
+ if ($qa->{'debug'}) {
+</%perl>
+<% $_ |h %>
+<%perl>
+ }
+}
+
+if ($qa->{'debug'}) {
+ print "</pre>\n";
+}