Problems with ellipse1 displacement

Hello,

I have lately been using ellipse1 to great success to plot tidal ellipses. Now I really would like to plot the ellipses on a map, but i cant displace the center of the ellipse with more than about 85 in the x and y direction. If I try with say 200, it only becomes a straight line.

In [lat,lon] = ellipse1(lat0,lon0,ellipse,offset) I have lat0 and lon0 values of several thousand, so I could really need some tips to how I can buypass this problem/limitation to the ellipse1 function.

Example of the data I am using in ellipse1:

ellipse

 0.5423 0.9929
0.9595 0.9919
0.3552 0.9984
0.9935 0.9922 
1.8352 0.9943 
0.1115 0.9767 
1.6259 0.9950 
0.0721 0.9835

offset

 21.9096 
12.0481 
29.3004 
17.2923 
5.2085 
93.3979 
5.2453 
117.5248

Thanks in advance,

Hans