If you desire location information that is more accurate than a smart phone, you will have to use a Bluetooth GPS device. Your average smartphone gets 3-5m accuracy under normal outdoor conditions. Below are the options to achieve a lower meter accuracy.
Here is a link to a more detailed comparison chart.
Maker | Model | Update Rate | Charge Time | Battery Life | Weight | Sat | Avg. Price |
Dual | 4 Hz | 2.5h | 8h | 1.8oz (51.03g) | +/- 2.5 m | $85 | |
Garmin | 10Hz | 3h | 12h | 2.12oz (60.1g) | 3 m | $99 | |
Dual | 10Hz | 3h | 10h | 2.6oz (73.1g) | +/- 2.5 m | $149 | |
Bad Elf | 10Hz | 4h | 25h+ | 3.2oz (90.7g) | +/- 2.5 m | $149 | |
Bad Elf | 10Hz | 4h | 25h+ | 3.2oz (90.7g) | +/- 2.5 m | $249 | |
Bad Elf | 1 Hz | 4h | 25h+ | 3.2oz (90.7g) | 1-3 m | $599 | |
Trimble | 10Hz | 5h | 16h | 9.5oz (269g) | 2 m | $999 | |
SXBlue | 1 Hz | 4h | 16h | 4oz (114g) | - 1 m | $1,695 | |
EOS | 10Hz/20Hz | 4h | 16h | 13.1oz (372g) | 30 – 60 cm | $1,995 | |
SXBlue | 20Hz | 3h | 10h | 18.24oz (517g) | 60 cm | $2,195 | |
Trimble | 1 Hz | 5h | 10h+ | 6.6oz (187g) | 60 cm | $2,495 | |
Trimble | 1, 2, or 5 Hz | 2.5 h | 10h+ | 38.1 oz | 50 cm | $2,700 | |
SXBlue | 1 Hz/10Hz/20Hz | 5h | 10h | 17.1oz (487g) | 60 cm | $2,895 | |
EOS | 10Hz/20Hz | 4h | 12h | 13.1oz (372g) | 30 – 60 cm | $2,995 | |
SXBlue | 1 Hz/10Hz/20Hz | 4-5h | 10h | 18.24oz (517g) | 60 cm | $3,695 | |
SXBlue | 1 Hz/10Hz/20Hz | 4-5h | 9h | 18.24oz (517g) | 10 cm | $6,995 | |
SXBlue | 1 Hz/10Hz/20Hz | 4-5h | 8h | 17.1oz (487g) | 1 cm | $6,995 | |
EOS | 10Hz/20Hz | 4h | 9h | 13.1oz (372g) | 30 – 60 cm | $6,995 | |
EOS | 10Hz/20Hz | 4h | 8.5h | 13.1oz (372g) | 30 – 60 cm | $7,995 |