[don1reed]

@jmr: The construction of a sextant allows the navigator to view the horizon through the horizon glass. The heavenly body is viewed and reflected by a mirror at the top of the index arm to be co-viewed through the horizon glass, and by slowly turning the micrometer drum at the bottom of the index arm, brings the horizon and body together as one.

The stars appears as pinpoints whereas the sun, moon and planets need corrections for semi-diameter and oblateness and horizontal parallax(moon) due to their relative larger size.

While the deck is pitching, the navigator tries to remain plumb & level, keeping the heavenly body and horizon in near proximity in the glass. He waits until his craft is atop a wave (not in a trough) to make his final adjustment to bring the horizon the body together as one and yells (if very windy) "MARK!). His time-keeper jots down the watch time while the navigator reads his arc and gives the angle to the time-keeper and goes and makes either a round of star sights or 3 or more sights of the sun/moon to get an average. Its a balancing act to be sure, but becomes second nature to those who do it for a living.

@ichso: It's been awhile since I eliminated my icon and I don't exactly remember where I got the mod; but the mod for SH4 may work for SH3 also...it's worth a try.

Look for the mod "no_sub_on_map" by Thendash.

cheers,