\begin{tikzpicture}           
% Grid
\draw [rounded corners,menublue,fill=gray99, ultra thin]
(0,2.75) -- (0,0) -- (7,0) -- (7,5.5) -- (0,5.5) -- (0,2.75);
\draw [color=gray95, thin] (3.5,0) -- (3.5,5.5);
\draw [color=gray95, thin] (3.95632,0) -- (3.95632,5.5);
\draw [color=gray95, thin] (4.41265,0) -- (4.41265,5.5);
\draw [color=gray95, thin] (4.86897,0) -- (4.86897,5.5);
\draw [color=gray95, thin] (5.32529,0) -- (5.32529,5.5);
\draw [color=gray95, thin] (5.78162,0) -- (5.78162,5.5);
\draw [color=gray95, thin] (6.23794,0) -- (6.23794,5.5);
\draw [color=gray95, thin] (6.69426,0) -- (6.69426,5.5);
\draw [color=gray95, thin] (3.04368,0) -- (3.04368,5.5);
\draw [color=gray95, thin] (2.58735,0) -- (2.58735,5.5);
\draw [color=gray95, thin] (2.13103,0) -- (2.13103,5.5);
\draw [color=gray95, thin] (1.67471,0) -- (1.67471,5.5);
\draw [color=gray95, thin] (1.21838,0) -- (1.21838,5.5);
\draw [color=gray95, thin] (0.76206,0) -- (0.76206,5.5);
\draw [color=gray95, thin] (0.305737,0) -- (0.305737,5.5);
\draw [color=gray95, thin] (0,2.75) -- (7,2.75);
\draw [color=gray95, thin] (0,3.20632) -- (7,3.20632);
\draw [color=gray95, thin] (0,3.66265) -- (7,3.66265);
\draw [color=gray95, thin] (0,4.11897) -- (7,4.11897);
\draw [color=gray95, thin] (0,4.57529) -- (7,4.57529);
\draw [color=gray95, thin] (0,5.03162) -- (7,5.03162);
\draw [color=gray95, thin] (0,5.48794) -- (7,5.48794);
\draw [color=gray95, thin] (0,2.29368) -- (7,2.29368);
\draw [color=gray95, thin] (0,1.83735) -- (7,1.83735);
\draw [color=gray95, thin] (0,1.38103) -- (7,1.38103);
\draw [color=gray95, thin] (0,0.924707) -- (7,0.924707);
\draw [color=gray95, thin] (0,0.468383) -- (7,0.468383);
\draw [color=gray95, thin] (0,0.01206) -- (7,0.01206);
% Grid
\draw [rounded corners,menublue, ultra thin]
(0,2.75) -- (0,0) -- (7,0) -- (7,5.5) -- (0,5.5) -- (0,2.75);


% Text Label
\draw [color=black] (6.08735,0.646349) node {\scriptsize
$\beta < 112.5$
};

% Draw Wedge: ownship:os_wedge
\draw [color=black,fill=gray97, very thin] 
(1.75228,4.02314) -- (1.50166,0.838726) arc (265.5:378:3.19426) -- (1.75228,4.02314) arc (378:265.5:0) -- cycle;
% Text Label
\draw [color=black] (0.912647,3.93188) node {\scriptsize
ownship
};

% Text Label
\draw [color=black] (4.62712,2.92797) node {\scriptsize
contact
};

% Text Label
\draw [color=black] (1.66102,0.472947) node {\tiny
$112.5^{\circ}$
};

% Text Label
\draw [color=black] (2.98435,3.40254) node {\tiny
$112.5^{\circ}$
};

% Text Label
\draw [color=black] (5.11082,5.03618) node {\tiny
$0^{\circ}$
};

% Ship drawing: inside triangle
\draw [color=gray90, fill=gray90, ultra thin] 
(3.74381,2.51728) -- (3.80574,2.9736) -- (3.86766,2.51728);
% Ship drawing: left side of bow 
\draw [color=black,fill=gray90, ultra thin] 
(3.74381,2.51728) .. controls (3.69166,2.80248) .. (3.80574,2.9736);
% Ship drawing: right side of bow 
\draw [color=black,fill=gray90, ultra thin] 
(3.86766,2.51728) .. controls (3.91982,2.80248) .. (3.80574,2.9736);
% Ship drawing: stern line 
\draw [color=black, ultra thin] 
(3.74381,2.51728) -- (3.86766,2.51728);
% Ship drawing: inside triangle
\draw [color=white, fill=white, ultra thin] 
(1.51615,4.01153) -- (1.96928,4.09365) -- (1.55442,3.89374);
% Ship drawing: left side of bow 
\draw [color=black,fill=white, ultra thin] 
(1.51615,4.01153) .. controls (1.76967,4.15421) .. (1.96928,4.09365);
% Ship drawing: right side of bow 
\draw [color=black,fill=white, ultra thin] 
(1.55442,3.89374) .. controls (1.84339,3.92732) .. (1.96928,4.09365);
% Ship drawing: stern line 
\draw [color=black, ultra thin] 
(1.51615,4.01153) -- (1.55442,3.89374);
% Draw Point: ownship:ship_ctr
\draw [color=black,fill=black, thin] 
(1.73403,4.02314) circle (0.02cm);
% Draw Point: contact:ship_ctr
\draw [color=black,fill=black, thin] 
(3.80574,2.74544) circle (0.02cm);
% Draw Line: contact:cn_north
\draw [color=gray25, ->, thin] 
(3.80574,2.74544) -- (3.80574,4.11441);
% Draw Circle: contact:range
\draw [color=darkblue, very thin] 
(3.80574,2.74544) circle (2.28162cm);
% Draw Wedge: contact:os_112
\draw [color=gray60, very thin] 
(1.68068,3.11331) -- (1.68068,3.11331) arc (265.5:378:0.912647) -- (2.62026,4.30517) arc (378:265.5:0.912647) -- cycle;
\end{tikzpicture}  
