The phrase "are within a certain" is correct and usable in written English.
It can be used when specifying a range or limit regarding a particular subject or context.
Example: "The results of the experiment are within a certain range of acceptable values."
Alternatives: "fall within a specific" or "lie within a defined".
However, they can communicate and exchange data only if they are within a certain distance, commonly called transmission range.
Agents can query the geography to determine whether agent features overlap or are within a certain distance of, intersect with, or border other agent features in the geography.
Using the GPS coordinates of your iPhone you can see what's going on at a handful of spots near you that are within a certain distance that you set.
Founded by Jeremy Potvin and James Woods (not that James Woods), the service allows workers to check in via phone when they are within a certain distance from their place of business.
The match scales are considered to be the operator scales of probe and gallery images, at which the change in number of stable pixels are within a certain match criteria.
During the simulation, it is often necessary to find the shortest path between two nodes, or more precisely, to find out which nodes are within a certain distance of a starting point, using shortest paths.
There should be a federal election law requiring an automatic hand recount if the presidential vote count is within a certain margin.
Note that the entrance is towards the back of the building, due to an old town ordinance prohibiting bars from being within a certain distance of churches.
"The dog has its vaccination and then one month later you check the blood to make sure the number of antibodies is within a certain range".
The problem here is that a phone's GPS function is not precise enough to determine reliably where a user is within a certain block.
