Here's a rough unscientific chart I put together showing the movement of Dennis during each 6 hour interval since July 5th. As you can see, historical movement over the last 2.5 days has been pretty much NW (a heading of 315 degrees). You will notice however that in 2 of last 3 intervals (i.e. today), movement was actually at a heading slightly greater than 315 degrees, perhaps signaling that gradual N/NW turn folks have been forecasting.

This might be hard to read, so I've attached it in a .txt format as well. Hope this is helpful.

TIME/DATE LAT LONG LAT CHG LNG CHG HEADING
11p 7/4 12.5 63.1 -- -- --
5a 7/5 12.6 64.4 0.1 1.3 274.4
11a 7/5 13.3 66.6 0.7 2.2 287.7
5p 7/5 14.2 68.3 0.9 1.7 297.9
11p 7/5 14.6 69.2 0.4 0.9 294.0
5a 7/5 15.1 70.3 0.5 1.1 294.4
11a 7/6 15.4 71.5 0.3 1.2 284.0
5p 7/6 16 72.5 0.6 1 301.0
11p 7/6 16.5 73.4 0.5 0.9 299.1
5a 7/7 17 74.6 0.5 1.2 292.6
11a 7/7 18 75.6 1 1 315.0
5p 7/7 19 76.6 1 1 315.0
11p 7/7 19.9 77.6 0.9 1 312.0
5a 7/8 20.7 79.1 0.8 1.5 298.1
11a 7/8 21.4 79.9 0.7 0.8 311.2
5p 7/8 22.6 81.1 1.2 1.2 315.0
11p 7/8 23 82.1 0.4 1 291.8
5a 7/9 23.9 82.9 0.9 0.8 318.4
11a 7/9 24.7 83.8 0.8 0.9 311.6
5p 7/9 25.7 84.6 1 0.8 321.3