No they are definitely navels, and they are ripening.
"Rod" wrote in message
...

"Sandra Bodycoat" wrote in message
. au...
Hi

I am in Perth and have a heavily laden navel orange tree, I want to know
how do I know when the fruit is truly ripe.
Last year we picked fruit only to find they looked ripe but were still a
bit sour.
Thanks
Sandra

At this time of the year in Perth the navels have just about all gone,
they ripen in June/July and are sweet around that time.

More likely your oranges are Valencias. Good for juicing, not as good
for eating as Navels but still reasonable. I found that mine are still
sour at this time of year and don't "sweeten up" until late August/
September.