Under normal circumstances and time compression under say.....256, the game takes a virtual sounding every so many seconds. Is the water under x feet deep? Yes, return TC to 1. No? Onward through the fog!
But when you really crank it up, to 1024 or higher especially, if it was real time, the virtual game soundings might take place an hour apart instead of five minutes apart in submarine time. If the game didn't back off on the sample rate it would choke to death you know.
So if you hit shallow water and virtual soundings are an hour apart in sub time that's plenty of time to get five miles inland before the next sounding. Then the game says "speed, 20 knots, water depth -150 feet. Looks like a collision to me. CRASH, BOOM, DONE, DEAD."
It's really important that after you plot a course, you scan that course at zoomed in level to ensure that there's no land in there too small to see when you're zoomed out. If you have to rip through there at 2048x it can save your life.
