[Simplex Repeater Operation?]

Does anything in the FCC rules prohibit the use of a Simplex Repeater setup on GMRS frequencies? For temporary or seasonal use for family & emergency or even camp host wellness checks this would be a very useful function to us that we have used in the past on other services such as Ham. However I seem to be overlooking where this feature is allowed or not allowed. Comments?

 

Davey WRTI-814/KU9L