\begin{tikzpicture}           
% Grid
\draw [rounded corners,menublue,fill=gray99, ultra thin]
(0,3) -- (0,0) -- (7,0) -- (7,6) -- (0,6) -- (0,3);
\draw [color=gray95, thin] (3.5,0) -- (3.5,6);
\draw [color=gray95, thin] (3.9104,0) -- (3.9104,6);
\draw [color=gray95, thin] (4.32079,0) -- (4.32079,6);
\draw [color=gray95, thin] (4.73119,0) -- (4.73119,6);
\draw [color=gray95, thin] (5.14159,0) -- (5.14159,6);
\draw [color=gray95, thin] (5.55198,0) -- (5.55198,6);
\draw [color=gray95, thin] (5.96238,0) -- (5.96238,6);
\draw [color=gray95, thin] (6.37278,0) -- (6.37278,6);
\draw [color=gray95, thin] (6.78317,0) -- (6.78317,6);
\draw [color=gray95, thin] (3.0896,0) -- (3.0896,6);
\draw [color=gray95, thin] (2.67921,0) -- (2.67921,6);
\draw [color=gray95, thin] (2.26881,0) -- (2.26881,6);
\draw [color=gray95, thin] (1.85841,0) -- (1.85841,6);
\draw [color=gray95, thin] (1.44802,0) -- (1.44802,6);
\draw [color=gray95, thin] (1.03762,0) -- (1.03762,6);
\draw [color=gray95, thin] (0.627223,0) -- (0.627223,6);
\draw [color=gray95, thin] (0.216826,0) -- (0.216826,6);
\draw [color=gray95, thin] (0,3) -- (7,3);
\draw [color=gray95, thin] (0,3.4104) -- (7,3.4104);
\draw [color=gray95, thin] (0,3.82079) -- (7,3.82079);
\draw [color=gray95, thin] (0,4.23119) -- (7,4.23119);
\draw [color=gray95, thin] (0,4.64159) -- (7,4.64159);
\draw [color=gray95, thin] (0,5.05198) -- (7,5.05198);
\draw [color=gray95, thin] (0,5.46238) -- (7,5.46238);
\draw [color=gray95, thin] (0,5.87278) -- (7,5.87278);
\draw [color=gray95, thin] (0,2.5896) -- (7,2.5896);
\draw [color=gray95, thin] (0,2.17921) -- (7,2.17921);
\draw [color=gray95, thin] (0,1.76881) -- (7,1.76881);
\draw [color=gray95, thin] (0,1.35841) -- (7,1.35841);
\draw [color=gray95, thin] (0,0.948016) -- (7,0.948016);
\draw [color=gray95, thin] (0,0.53762) -- (7,0.53762);
\draw [color=gray95, thin] (0,0.127223) -- (7,0.127223);
% Grid
\draw [rounded corners,menublue, ultra thin]
(0,3) -- (0,0) -- (7,0) -- (7,6) -- (0,6) -- (0,3);


% Draw Wedge: contact:cn_wedge
\draw [color=black,fill=gray95, very thin] 
(1.88714,4.26813) -- (1.66175,1.4042) arc (265.5:378:2.87278) -- (1.88714,4.26813) arc (378:265.5:0) -- cycle;
% Text Label
\draw [color=black] (1.13201,4.18605) node {\scriptsize
contact
};

% Text Label
\draw [color=black] (4.47264,3.28317) node {\scriptsize
ownship
};

% Text Label
\draw [color=black] (1.80506,1.07524) node {\tiny
$112.5^{\circ}$
};

% Text Label
\draw [color=black] (2.99521,3.70999) node {\tiny
$112.5^{\circ}$
};

% Text Label
\draw [color=black] (4.90766,5.17921) node {\tiny
$0^{\circ}$
};

% Text Label
\draw [color=black] (5.86799,0.820793) node {\scriptsize
$\alpha \leq 112.5^{\circ}$
};

% Ship drawing: inside triangle
\draw [color=gray90, fill=gray90, ultra thin] 
(3.67824,2.91382) -- (3.73393,3.32421) -- (3.78962,2.91382);
% Ship drawing: left side of bow 
\draw [color=black,fill=gray90, ultra thin] 
(3.67824,2.91382) .. controls (3.63133,3.17031) .. (3.73393,3.32421);
% Ship drawing: right side of bow 
\draw [color=black,fill=gray90, ultra thin] 
(3.78962,2.91382) .. controls (3.83653,3.17031) .. (3.73393,3.32421);
% Ship drawing: stern line 
\draw [color=black, ultra thin] 
(3.67824,2.91382) -- (3.78962,2.91382);
% Ship drawing: inside triangle
\draw [color=white, fill=white, ultra thin] 
(1.67478,4.25768) -- (2.0823,4.33154) -- (1.7092,4.15175);
% Ship drawing: left side of bow 
\draw [color=black,fill=white, ultra thin] 
(1.67478,4.25768) .. controls (1.90278,4.38601) .. (2.0823,4.33154);
% Ship drawing: right side of bow 
\draw [color=black,fill=white, ultra thin] 
(1.7092,4.15175) .. controls (1.96908,4.18195) .. (2.0823,4.33154);
% Ship drawing: stern line 
\draw [color=black, ultra thin] 
(1.67478,4.25768) -- (1.7092,4.15175);
% Draw Point: contact:ship_ctr
\draw [color=black,fill=black, thin] 
(1.87073,4.26813) circle (0.02cm);
% Draw Point: ownship:ship_ctr
\draw [color=black,fill=black, thin] 
(3.73393,3.11902) circle (0.02cm);
% Draw Line: ownship:os_north
\draw [color=gray25, ->, thin] 
(3.73393,3.11902) -- (3.73393,4.35021);
% Draw Circle: ownship:range
\draw [color=darkblue, very thin] 
(3.73393,3.11902) circle (2.05198cm);
% Draw Wedge: contact:cn_112
\draw [color=gray60, very thin] 
(1.82274,3.44986) -- (1.82274,3.44986) arc (265.5:378:0.820793) -- (2.66776,4.52176) arc (378:265.5:0.820793) -- cycle;
\end{tikzpicture}  
