GPRMC形式的資料 如何計算距離

$GPRMC,120900.00,A,2259.79076,N,12013.40728,E,0.040,303.25,101209,,23.87
$GPRMC,121200.00,A,2259.78627,N,12013.40593,E,0.076,336.98,101209,,23.36
$GPRMC,121500.00,A,2259.78639,N,12013.40520,E,0.056,340.12,101209,,23.56
$GPRMC,121800.00,A,2259.78721,N,12013.40481,E,0.040,356.20,101209,,23.83
$GPRMC,122100.00,A,2259.78860,N,12013.40616,E,0.035,331.28,101209,,23.58

這是我抓下來的資料

我想判斷第一筆和第二筆資料的距離相差多少

1.請問GPRMC的資料是屬於哪一個座標係
是WGS84?

2.是不是要先轉成TWD97的座標
在利用畢氏定理求得

3.請問有沒有人用VB2005寫過此程式

順便一問TWDTM2座標又是什麼

我快搞混了