Wel lI got a response from BMW on this topic!
Here is there response;
"This is just a poor English translation.
• “high guiding” means the directional arrows that are typical of nav systems. (i.e. read it as a “high-level guidance”)
• “lane guiding” refers to our “ramp view”, which shows you exactly which lane to get into on an off ramp. (i.e. read it as a “detailed lane-level guidance”). This feature is particularly useful on ramps around 400/407, Airports, etc.
I’ll have our web colleagues look into alternate ways to communicate these features more clearly. Thanks for bringing it to our attention."