compass error is not horror

1. BY
BOBOTOH PERSIB

2.  We Need To Know :
1.Bearing Of The celestial Body ( Sun,Planet,Star
etc..)
2.Time UTC
3.Vessel Position
4.Ships Gyro Heading
5.Ships Magnetic Heading

3. GYRO / MAGNETIC ERROR PRO FORMA
Celestial Body Sun Date&Time / UTC 10/04/16 @22:20:00
Bearing Of The Sun 277 Magnetic Heading 145
Gyro Heading 132
Assumed Position 25˚50,6’ N - 066˚08.6’ W
GHA 149˚ 43.8 DEC N 8˚ 21.9
*SHA (Star) ± Cd ( 0.9 ) 0.3
± Cv (Moon,Planets) DEC N 8˚ 22.2
± Inc 5˚ 00.0
GHA 154˚ 43.8
+ LONG -066˚ 08.6
LHA 088˚ 35.2
Perhitungan diatas semua ada dalam ‘’ALMANAC NAUTICA’’

4. Az= 𝐭𝐚𝐧−𝟏
(𝐬𝐢𝐧− 𝑳𝑯𝑨÷ 𝒄𝒐𝒔± 𝑳𝑨𝑻× 𝒕𝒂𝒏± 𝑫𝑬𝑪 − 𝒔𝒊𝒏 ± 𝑳𝑨𝑻× 𝒄𝒐𝒔− 𝑳𝑯𝑨 )
Az=tan−1
(sin−088˚35.2 ÷ 𝑐𝑜𝑠25°50.6× 𝑡𝑎𝑛8°22.2 − 𝑠𝑖𝑛25°50.6× 𝑐𝑜𝑠−088°35.2 )
Az=−83.06
Az=N83.06W (karenanilaiAzimuthnegative beradadiantara000-180)
LHA 000 -180 180 – 360
+ Az S Az W N Az E
- Az N Az W S Az E

5. Note:-DalamrumusnilaiLHAselalunegative(-)
-NilaiLATpositifapabilalintangposisikapalN(utara)begitupunsebaliknya
-NilaiDeclinasipositifapabilapenyebutnyaN(utara)begitupunsebaliknya
-Untukpengerjaandikalkulator,kerjakanduluyangdidalamkurung
tan−1
𝑎𝑟𝑡𝑖𝑛𝑦𝑎 𝑖𝑛𝑣𝑒𝑟𝑠tan 𝑡𝑖𝑛𝑔𝑔𝑎𝑙 𝑘𝑙𝑖𝑘 𝒔𝒉𝒊𝒇𝒕 𝐭𝐚𝐧 𝒅𝒊𝒊𝒌𝒖𝒕𝒊 𝒉𝒂𝒔𝒊𝒍 𝒅𝒂𝒍𝒂𝒎 𝒌𝒖𝒓𝒖𝒏𝒈

6. Az = N 83.06 W
True Bearing = 279.9˚ T ( True )
NW
Quadrant
( 360-Az )
NE
Quadrant
( 0 + Az )
SW
Quadrant
( 180 + Az )
SE
Quadrant
( 180 – Az )
True bearing 279.9˚ karena penyebut Az NW, maka 360 – 83.06

7. Gyro Error Magnetic Error
True Bearing 276.9˚ T True Heading 131.9˚ T
Gyro Bearing 277˚ G - Mag Heading 145
Error : -0.1˚ (H) Error : - 13.1˚ (W)
Gyro Heading 132˚ G - Variation - 13.7˚ (W)
±Gyro Error -0.1˚ Deviation 0.6˚
True Heading 131.9˚ T
Untuk penyebut Error gyro H ( Hight ) jika errornya negative, apabila errornya positif
penyebutny L ( Low ) ada juga sebagian memakai symbol W( west ) jika negative dan E ( east )
jika positif.
Regads ,BOBOTOH PERSIB