The lots have all been surveyed with all corners properly marked. In answer to your question, you are able to walk up and down the subdivision roads and see signage markers on each lot identifying it by parcel number. The overwhelming majority of buyers have walked through the subdivision and picked out their specific lots by number based on the lots being clearly marked. The subdivision map makes it very easy to see the location of each and every lot in the subdivision.
Take me up on my offer and I'll show you first hand. Here are some sample photos of survey markers (photo 1) and lot signage located throughout the subdivision. PM me and I'll be happy to send you a detailed subdivision map showing every lot sold, reserved and available, as well as each of the price points.
If any buyer wants to hire a surveyor to flag their lot markers or resurvey their lot, they are welcome to do so. I would be happy to provide contact info for several licensed surveyors. The approved subdivision map and surveys clearly show all lot dimensions and it is not difficult to identify a particular block of lots within the subdivision, and correspond the clearly marked lots with the subdivision plan.
I have been with clients throughout most, if not every subdivision on Ambergris Caye, and the lots in Grand Belizean Estates are more clearly identified and the survey markers more readily located and recognizable than in any other subdivision. No real surprise since it has been surveyed more recently than most. That said, bring your surveyor with you, the more the merrier! (He will probably want to buy a lot, too.)