We had a lecturer on board a cruise last year & he set his telescopes up on a couple of the evenings to show everyone the various red, white & blue stars out there (No, he wasn't focused on your flag
He had to readjust every 5 minutes or so, and to be honest, our cheap binoculars were able to give us equally as good images, and a lot easier to pack.
We did have some light polution from the ship, but compared to back home here our part of the UK it was pretty amazing.
Alan & Katrina
Last: Oceania Nautica Aug 2016
Next: Cruise Maritime Magellan Nov 2016
Then: P&O Oceana December 2016
Then: NCL Jade August 2017
Golden, Grand(2), Caribbean, Royal, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Britannia, Oceana(3), Oriana(12), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(7), QE, Caronia(2),
Oceania Nautica, Minerva, Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey