How to get value of post-type custom field

get_field_value( $field, false, $PostID )

$field: It is a required argument. Put here your field name.

false: It is an optional argument. It ensure what type of data you looking for either rendered data or raw output.
for example if you getting value of Map field and you want to get complete map not only lat,lng and address, then you need to set it as TRUE
If you only want raw data like an array with address, lat and lng then you need to set it as false. Default = false

$PostID: It is an optional argument. if you are trying to get field value on post-type single page then no need to use this argument but if you trying to get it on any other page then you need to send post id as an argument.