2. The method of claim 1 , wherein selecting the symbols for the third grouping of symbols further comprises: selecting all but one of the symbols of the second grouping, when the navigation pace is determined to be at or below a threshold rate; and selecting at least one of: (i) a plurality of symbols, wherein each symbols of the plurality of symbols is not contained in the second grouping, and (ii) all but at least two of the symbols of the second grouping, when the navigation pace is determined to be above the threshold rate.
2. The method of claim 1 , wherein selecting the symbols for the third grouping of symbols further comprises: selecting all but one of the symbols of the second grouping, when the navigation pace is determined to be at or below a threshold rate; and selecting at least one of: (i) a plurality of symbols, wherein each symbols of the plurality of symbols is not contained in the second grouping, and (ii) all but at least two of the symbols of the second grouping, when the navigation pace is determined to be above the threshold rate. 3. The method of claim 2 further comprising: identifying a symbol of the sequence of symbols, wherein the identified symbol is adjacent to at least one of a first symbol and a last symbol of the second grouping of symbols; and excluding the identified symbol from the symbols of the third grouping of symbols.