10-19-2018, 08:14 AM
Good day, Shipmates
I went to a pier on Lapu-Lapu island yesterday and spent a few hours taking shots. As you see below there are two groups of observations - a set in the morning and a set a few hours later - so a fix is possible. You may use any or all shots averaged to work out the CN position. My results came to about one nautical mile accuracy with each group averaged. I used the standard pubs.... I might go back and try the calculator method... practice practice practice....
GPS position = N 10 14.583
E 123 57.351
GMT Oct 18, 2018
DIP = 15'
IE = 0
Sun LL
HHMMSS/ DDMM.M
002035 3850.0
002200 3908.2
002347 3934.2
002458 3951.2
002603 4005.0
002705 4021.0
002846 4044.4
002947 4057.6
003125 4120.5
003250 4139.6
035410 6903.0
035617 6853.8
035801 6846.6
035946 6837.1
040124 6828.2
040239 6821.4
040419 6810.6
040532 6804.1
040707 6754.0
040843 6743.4
On my chart one nautical mile is only about 2mm so I'm pretty happy about the accuracy. I can easily see mountainous islands 30 miles away.
Have fun
Joe
PS... Height of eye might be suspect. 15 feet was a guess, but it might have been two or three feet higher or lower. This might account for the one NM inaccuracy.
I went to a pier on Lapu-Lapu island yesterday and spent a few hours taking shots. As you see below there are two groups of observations - a set in the morning and a set a few hours later - so a fix is possible. You may use any or all shots averaged to work out the CN position. My results came to about one nautical mile accuracy with each group averaged. I used the standard pubs.... I might go back and try the calculator method... practice practice practice....
GPS position = N 10 14.583
E 123 57.351
GMT Oct 18, 2018
DIP = 15'
IE = 0
Sun LL
HHMMSS/ DDMM.M
002035 3850.0
002200 3908.2
002347 3934.2
002458 3951.2
002603 4005.0
002705 4021.0
002846 4044.4
002947 4057.6
003125 4120.5
003250 4139.6
035410 6903.0
035617 6853.8
035801 6846.6
035946 6837.1
040124 6828.2
040239 6821.4
040419 6810.6
040532 6804.1
040707 6754.0
040843 6743.4
On my chart one nautical mile is only about 2mm so I'm pretty happy about the accuracy. I can easily see mountainous islands 30 miles away.
Have fun
Joe
PS... Height of eye might be suspect. 15 feet was a guess, but it might have been two or three feet higher or lower. This might account for the one NM inaccuracy.