MySQL 8.0

By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.

create table t as
     select 1  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:00:00' as datetime) as timestamp union all
     select 2  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:01:00' as datetime) as timestamp union all
     select 3  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:02:00' as datetime) as timestamp union all
     select 4  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:03:00' as datetime) as timestamp union all
     select 5  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:04:00' as datetime) as timestamp union all
     select 6  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:15:00' as datetime) as timestamp union all
     select 7  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:16:00' as datetime) as timestamp union all
     select 8  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:17:00' as datetime) as timestamp union all
     select 9  as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 01:18:00' as datetime) as timestamp union all
     select 10 as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 02:10:00' as datetime) as timestamp union all
     select 11 as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 02:11:00' as datetime) as timestamp union all
     select 12 as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 02:12:00' as datetime) as timestamp union all
     select 13 as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 02:13:00' as datetime) as timestamp union all
     select 14 as id, 80.1 as lat, -120.2 as lng, cast('2021-03-01 02:14:00' as datetime) as timestamp

Records: 14  Duplicates: 0  Warnings: 0

id	lat	lng	timestamp	prev_timestamp_ll	prev_timestamp	grp
1	80.1	-120.2	2021-03-01 01:00:00	null	null	0
2	80.1	-120.2	2021-03-01 01:01:00	2021-03-01 01:00:00	2021-03-01 01:00:00	0
3	80.1	-120.2	2021-03-01 01:02:00	2021-03-01 01:01:00	2021-03-01 01:01:00	0
4	80.1	-120.2	2021-03-01 01:03:00	2021-03-01 01:02:00	2021-03-01 01:02:00	0
5	80.1	-120.2	2021-03-01 01:04:00	2021-03-01 01:03:00	2021-03-01 01:03:00	0
6	80.1	-120.2	2021-03-01 01:15:00	2021-03-01 01:04:00	2021-03-01 01:04:00	1
7	80.1	-120.2	2021-03-01 01:16:00	2021-03-01 01:15:00	2021-03-01 01:15:00	1
8	80.1	-120.2	2021-03-01 01:17:00	2021-03-01 01:16:00	2021-03-01 01:16:00	1
9	80.1	-120.2	2021-03-01 01:18:00	2021-03-01 01:17:00	2021-03-01 01:17:00	1
10	80.1	-120.2	2021-03-01 02:10:00	2021-03-01 01:18:00	2021-03-01 01:18:00	2
11	80.1	-120.2	2021-03-01 02:11:00	2021-03-01 02:10:00	2021-03-01 02:10:00	2
12	80.1	-120.2	2021-03-01 02:12:00	2021-03-01 02:11:00	2021-03-01 02:11:00	2
13	80.1	-120.2	2021-03-01 02:13:00	2021-03-01 02:12:00	2021-03-01 02:12:00	2
14	80.1	-120.2	2021-03-01 02:14:00	2021-03-01 02:13:00	2021-03-01 02:13:00	2