"indicate the position" is a correct and usable phrase in written English.
For example, "Please indicate the position you would like to apply for on your application form."
Arrows indicate the position of a growing tip.
The arrows indicate the position of a growing tip.
Blue arrows indicate the position of the light fibre.
The lines of nails on the boards indicate the position of the joists underneath.
Alternating bands of transparent and blue tinted glass indicate the position of production and presentation areas.
The red boxes indicate the position of the promoter region of each isoform.
Encircling scars indicate the position of leaf sheaths already shed by the mature stems.
The letters indicate the position of the centre of the shadow.
Numbers indicate the position of the first residue in each motif on hBest1.
Single arrowheads indicate the position of a native EnStef (theoretical MW 10.8 kDa).
The shaded bands indicate the position of the different distribution ventiles.
