Just to clarify...you do not need a navigator for CDE if driving a SINGLE VSE. VSE multiple hitches DO require a navigator -- with fullsized horses, a navigator/groom is required for each pair of horses...so, one if driving a pair, two if driving a four-up, etc.-but with VSEs, one will do for a pair, a tandem, a four-up, or a unicorn( per 2008 ADS Rulebook).
A horse is considered a VSE in ADS if it is UNDER 99 CM, measured at the top of the withers, in height. This converts to just UNDER 39",if memory serves. It is true that if there is no separate division for VSEs, and a VSE is then required to be grouped in with the Small Pony division, they WOULD be required to have a navigator,per the rules for the Small Pony division.
An FYI--I have seen several ads where someone advertises a "VSE", and says it would be great for CDE(?!), BUT, also states that it is 40 or 41" tall; such an animal would NOT qualify for ADS entry as a VSE....so potential buyer, beware.
Margo