Great, thanks for the help! I add the code as you suggested and got it working, here are the results.
Sample of the data for 1 Hz. As you can see it only records RMC sentences.
A screen capture of the serial monitor for 1 Hz,it captures full GGA and RMC sentences with checksums.
Screen capture of the serial monitor for 5 Hz. Looks like there are several places that the RMC sentences are dropping characters.
Sample data from the data file at 5 Hz. It actually wrote to it this time but as you can see the RMC sentences aren't consistent and don't include the checksum characters.
$GPGGA,020716.200,4722.9714,N,12205.7301,W,1,7,0.94,140.1,M,-17.4,M,,*66
$GPGGA,020716.600,4722.9714,N,12205.7300,W,1,7,0.94,140.1,M,-17.4,M,,*63
$GPGGA,020716.800,4722.9714,N,12205.7300,W,1,7,0.94,140.1,M,-17.4,M,,*6D
$GPGGA,020717.000,4722.9714,N,12205.7300,W,1,7,0.94,140.1,M,-17.4,M,,*64
$GPGGA,020717.800,4722.9714,N,12205.7299,W,1,7,0.94,140.2,M,-17.4,M,,*6E
$GPGGA,020718.600,4722.9714,N,12205.7299,W,1,7,0.94,140.5,M,-17.4,M,,*68
$GPGGA,020719.200,4722.9714,N,12205.7300,W,1,7,0.94,140.7,M,-17.4,M,,*6E
$GPGGA,020719.600,4722.9714,N,12205.7300,W,1,7,0.94,140.8,M,-17.4,M,,*65
$GPGGA,020719.800,4722.9714,N,12205.7300,W,1,7,0.94,140.9,M,-17.4,M,,*6A
$GPRMC,020720.000,A,4722.9713,N,1220.3,,.,.0374,*7$GPGGA,020720.400,4722.9713,N,12205.7300,W,1,7,0.94,141.0,M,-17.4,M,,*63
$GPGGA,020721.200,4722.9713,N,12205.7298,W,1,7,0.94,140.9,M,-17.4,M,,*6C
$GPGGA,020721.800,4722.9713,N,12205.7297,W,1,7,0.94,140.7,M,-17.4,M,,*67
$GPGGA,020722.200,4722.9712,N,12205.7297,W,1,7,0.94,140.6,M,-17.4,M,,*6E
$GPGGA,020722.400,4722.9712,N,12205.7297,W,1,7,0.94,140.5,M,-17.4,M,,*6B
$GPGGA,020723.000,4722.9712,N,12205.7296,W,1,7,0.94,140.4,M,-17.4,M,,*6E
$GPGGA,020723.600,4722.9711,N,12205.7295,W,1,7,0.94,140.3,M,-17.4,M,,*6F
$GPGGA,020724.000,4722.9711,N,12205.7295,W,1,7,0.94,140.3,M,-17.4,M,,*6E
$GPGGA,020724.200,4722.9711,N,12205.7294,W,1,7,0.94,140.2,M,-17.4,M,,*6C
$GPGGA,020724.400,4722.9711,N,12205.7294,W,1,7,0.94,140.2,M,-17.4,M,,*6A
$GPGGA,020724.800,4722.9710,N,12205.7294,W,1,6,1.13,140.1,M,-17.4,M,,*6B
$GPGGA,020725.400,4722.9709,N,12205.7294,W,1,6,1.13,140.0,M,-17.4,M,,*6F
$GPGGA,020725.600,4722.9709,N,12205.7293,W,1,7,0.94,139.9,M,-17.4,M,,*62
$GPGGA,020726.400,4722.9709,N,12205.7292,W,1,7,0.94,139.6,M,-17.4,M,,*6D
$GPGGA,020726.600,4722.9708,N,12205.7292,W,1,7,0.94,139.6,M,-17.4,M,,*6E
$GPGGA,020727.000,4722.9708,N,12205.7292,W,1,7,0.94,139.5,M,-17.4,M,,*6A
$GPGGA,020727.200,4722.9708,N,12205.7292,W,1,7,0.94,139.5,M,-17.4,M,,*68
$GPGGA,020727.400,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*6D
$GPGGA,020728.400,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*62
$GPGGA,020728.600,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*60
$GPGGA,020728.800,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*6E
$GPGGA,020729.600,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*61
$GPGGA,020729.800,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*6F
$GPGGA,020730.000,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*6F
$GPGGA,020731.400,4722.9708,N,12205.7291,W,1,7,0.94,139.5,M,-17.4,M,,*6A
$GPGGA,020732.000,4722.9708,N,12205.7291,W,1,7,0.94,139.4,M,-17.4,M,,*6C
$GPRMC,020732.200,A,4722.9708,N,1220.2,,.,.0304,A2$GPGGA,020732.800,4722.9708,N,12205.7291,W,1,7,0.94,139.4,M,-17.4,M,,*64